CN113965511A - Tag data transmission method based on RDMA (remote direct memory Access), and related device and system - Google Patents
Tag data transmission method based on RDMA (remote direct memory Access), and related device and system Download PDFInfo
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
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Abstract
The invention provides a tag data transmission method based on RDMA (remote direct memory Access), and a related device and system. The method for sending data, the method for receiving data, the RDMA-based label data transmission method based on the method, and the related data message sending/receiving device, the computer network system and the computer readable storage medium mainly construct the RDMA transmission data segment comprising the label and the data which are separated by the separation mark and execute the RDMA sending of the RDMA transmission data segment by the internal copy of the label and the data which request cross-end communication at the source host end, and analyze the RDMA transmission data segment by the separation mark at the destination host end, thereby realizing the more extensive, simple and efficient cross-end transmission of the label and the data in the label data.
Description
Technical Field
The invention relates to the technical field of computer communication, in particular to a tag data transmission method based on RDMA (remote direct memory Access), and a related device and system.
Background
With the development of electronic information technology, more and more electronic computer services are widely provided for the production and living activities of people. However, the ability of a single computer device to provide services is limited; more and more computer services, especially powerful computer services, are now implemented by computer clusters formed by a plurality of computer devices. Different computer devices are connected through a network to form a server cluster, and then various computer services are provided for people. When the service is provided to the outside, the calling and data interaction between the cross-computer equipment terminals, namely the cross-end data communication between the computers, is not required. The cross-end communication between computer devices is usually realized under the support of TCP/IP protocol.
However, in the conventional TCP/IP technology, a large amount of server resources and memory bus bandwidth are required to be occupied by an operating system and other software layers in the process of processing data packets, and data is copied and moved among a system memory, a processor cache and a network controller cache, which causes a heavy burden on a CPU and a memory of a server. Especially the severe "mismatch" of network bandwidth, processor speed and memory bandwidth, exacerbates the network latency effect.
RDMA is a remote direct data access technology. As a remote memory access technique, RDMA enables a computer to directly access the memory of other computers without processing by a processor. RDMA moves data quickly from one system to the memory of a remote system without any impact on the operating system. Due to the above advantages of RDMA communication, in more and more application scenarios, especially in the field of big data and AI, when a large amount of data remote communication requests are generated, the RDMA protocol is more and more selected to perform cross-end data transmission.
However, in these application scenarios, cross-end communication involving tagged data (i.e., tagged data objects) is not avoided; this includes not only data objects that are originally tagged with a corresponding tag, but also data objects that are originally untagged but are (temporarily or permanently) tagged as necessary during execution of the application. In the existing communication technical solution, a TCP/IP-based communication framework is generally not concerned about and technically does not perceive a tag related to cross-end communication and a memory address corresponding to data, and they are generally sent to a destination host end packet by packet according to a certain data format through CPU copy and under the support of an operating system kernel protocol stack, and are resolved at the destination host end to realize effective communication. However, RDMA is a "zero-copy" technique, bypassing the operating kernel; in addition, there is also a lack of data format support above this; even if the destination host receives the data, the data is only regarded as unrecognized byte stream, and the data cannot be analyzed and recognized.
In addition, the tags, especially those that need to be generated by functional modules other than the communication module for a certain function or certain specific functions, are difficult for the underlying communication module to perceive its corresponding relationship with data; meanwhile, the tag is small data, and when the tag is used as a small and independent data object for RDMA communication, because the RDMA communication request call itself has a certain overhead, the small data transmission object of the tag is often negative in the RDMA-based transmission.
Disclosure of Invention
In view of this, the present invention provides a tag data transmission method based on RDMA, and a related apparatus and system.
In one aspect, an embodiment of the present invention provides a method for sending data, which is applied to a source host end in a cross-end communication system of a computer, and is particularly applied to RDMA transmission of tag data, and is capable of generating an RDMA packet including tag data (i.e., tag and data corresponding to each other) and sending the RDMA packet.
The method for sending the label data comprises the following steps: copying data and tags which are required to be transmitted across terminals into a memory with continuous addresses for the data and the tags which correspond to the data and the tags which are required to be transmitted across terminals, and splicing the data and the tags to construct an RDMA transmission data segment which can be effectively identified and analyzed at a destination host terminal; wherein the RDMA transfer data segment comprises: the label, the data and a separation mark between the label and the data;
registering a memory corresponding to the RDMA transmission data segment as an RDMA memory; generating an RDMA message loading label data; and sending the RDMA message; wherein the content of the first and second substances,
in fact, each RDMA message includes all or part of the data of the tag, the data and the separation identifier; and all RDMA messages are loaded with the label, the separation mark and the data content together.
In some embodiments of the first aspect, as a possible implementation manner, the method for sending data includes: and applying for a memory with continuous block addresses by a DMA engine to serve as the memory with continuous addresses, and copying the data and the tags into the memory by the DMA engine to realize the construction of the RDMA transmission data segment.
In some embodiments of the first aspect, as yet another possible implementation manner, a method for sending data includes: the RDMA data transmission is single-side RDMA; namely, the basic semantic operation is an RDMA read operation or an RDMA write operation, so as to reduce message transmission and interaction between two communication ends and provide overall communication efficiency.
In another aspect, an embodiment of the present invention provides a method for receiving data, where the method is applied to a destination host in a cross-end computer communication system, and is particularly applied to RDMA transmission of tag data, where the method is capable of receiving an RDMA packet including tag data (i.e., tags and data corresponding to each other), and parsing and acquiring the transmitted tags and data from the RDMA packet.
With reference to the first aspect, correspondingly, the tag data receiving method includes: for the received tag data, specifically, receiving all the RDMA messages thereof to obtain a complete data segment including the tag data, namely, an RDMA transmission data segment sent by the source host end; the RDMA transfer data segment described above includes: transmitted labels, data and separation marks between the two; and resolving the RDMA transmission data segment, and acquiring the transmitted tag and data in the RDMA transmission data segment by using the separation mark in the RDMA transmission data segment so as to provide the related application access or call at the destination host end.
In some embodiments of the second aspect, as a possible implementation manner, preferably, the parsing of the tag data, that is, parsing the RDMA transmission data segment, may be by traversing the RDMA transmission data segment, identifying a separation identifier therein, and accordingly deriving a memory offset of the tag and the data to be transmitted, and respectively obtaining the corresponding tag and the data in the RDMA transmission data segment according to the memory offset.
In another aspect, an embodiment of the present invention provides an RDMA-based tag data transmission method, which is applied to RDMA transmission of tag data in a cross-end communication system of a computer, where the system includes a source host-end device and a destination host-end device; the source host end device is used for sending the label data, and the destination host end device is used for receiving the label data.
With reference to the first and second aspects, the RDMA-based tag data transmission method includes:
for the data and the corresponding tag of the cross-end transmission requested by the source host end, the method for sending the data described in the first aspect is executed at the source host end, and the method for receiving the data described in the second aspect is executed at the destination host end.
In another aspect, an embodiment of the present invention provides an apparatus for RDMA packet sending of tag data.
In combination with the above aspects, the RDMA packet sending apparatus includes: an RDMA network card, a processor, and a memory; wherein the memory stores a computer program operable on the processor; and when executing the computer program, the processor can execute the method for sending data in the first aspect together with the RDMA network card.
In another aspect, an embodiment of the present invention provides an apparatus for RDMA packet reception of tag data.
In combination with the above aspects, the RDMA packet receiving apparatus includes: an RDMA network card, a processor, and a memory; wherein the memory stores a computer program operable on the processor; and the processor, when executing the computer program, can execute the method for receiving data according to the second aspect together with the RDMA network card.
In yet another aspect, an embodiment of the present invention provides a computer network system.
In combination with the above aspects, the computer network system described above includes:
a plurality of RDMA message sending devices according to the fourth aspect; and a plurality of RDMA message receiving devices according to the fifth aspect; and they are connected to each other through an RDMA network. In addition, in the real deployment of the computer network system, the same computer may be used as a device for sending an RDMA packet according to the fourth aspect (i.e., a source host side), or may be used as a device for receiving an RDMA packet sent by another source host side device, i.e., a device for receiving an RDMA packet according to the fifth aspect.
In yet another aspect, an embodiment of the present invention provides a computer-readable storage medium.
The computer-readable storage medium stores code for performing tag data transmission, including: instructions for performing method operations for transmitting data as described in the first aspect, and/or instructions for method operations for receiving data as described in the second aspect, or instructions for RDMA-based tag data transfer method operations as described in the third aspect.
The method for sending data, the method for receiving data, and the RDMA-based tag data transmission method based on the same, and the related data message sending/receiving device, the computer network system and the computer readable storage medium provided by the above embodiments mainly construct, at the source host, an RDMA transmission data segment including and separated by a separation identifier by an internal copy of a tag and data requesting cross-end communication, and perform RDMA sending of the RDMA transmission data segment, and parse the RDMA transmission data segment by the separation identifier at the destination host, thereby realizing more extensive, simple and efficient cross-end transmission of the tag and data in the tag data.
The technical solution of the present invention is further described with reference to the accompanying drawings and specific embodiments.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings related to a part of the embodiments of the present invention or the description in the prior art will be briefly introduced below.
FIG. 1 is a diagram illustrating the process of constructing an RDMA transfer data segment in some preferred embodiments of the invention;
FIG. 2 is a diagram illustrating parsing tag data in accordance with some preferred embodiments of the invention;
fig. 3 is a flowchart illustrating a method for RDMA-based tag data transmission according to a preferred embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of a portion of the invention and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the prior art, a typical TCP/IP protocol-based computer cross-end communication framework has the advantages of mature technical scheme, rich solution, reliability, easy use, and the like, but in the face of large data cross-end transmission, a communication bottleneck is formed during large data communication, especially during communication peak due to the inherent defects of the initial design of the TCP/IP protocol-based communication framework, and the overall system efficiency is affected. While RDMA, as a remote memory access technique, enables a computer to directly access the memory of other computers without the need for processing by a processor, the above-described problems are overcome to some extent. However, when cross-end communication involving tagged data (i.e. tagged data object), RDMA bypasses the operation kernel and lacks support of data format mechanism like TCP/IP communication framework, so even data received by the destination host end is only treated as unrecognizable byte stream and cannot be resolved. In addition, if the communication is separated, not only the corresponding relationship between the tag and the data in the transmission process cannot be guaranteed, but also the RDMA-based transmission of the data transmission object with a small number of bytes, such as the tag, is often negative in revenue (certain overhead exists in the registration memory and the control message communication in the registration memory in the RDMA communication process).
Therefore, the invention provides a tag data transmission method based on RDMA, a related device and a related system, which are used for realizing RDMA sending and receiving of tag data, and wherein the tag data and the tag data are transmitted more widely, simply and efficiently and together across ends.
The following are some preferred embodiments of the invention. Wherein the content of the first and second substances,
some preferred embodiments of the present invention provide a method for sending data, which is applied to a source host end in a cross-end communication system of a computer, and in particular, to RDMA transmission of tag data, and is capable of generating an RDMA packet including tag data (i.e., tag and data corresponding to each other) and sending the RDMA packet. The method comprises the following steps: for data requested to be transmitted across terminals and corresponding tags thereof, constructing RDMA transmission data segments by utilizing the tags and the data, and performing RDMA across terminal communication on the constructed RDMA transmission data segments. The specific implementation of the method, particularly the construction process thereof, can be as shown in fig. 1, and the implementation process includes: for the data 102 requesting communication and its corresponding tag 101; generating a specific separation mark 104, simultaneously applying for a free memory 103 which has the same size with the tag 101, the data 102 and the separation mark 104 and has continuous addresses, copying the tag 101, the data 102 and the separation mark 104 to the free memory 103 for splicing, enabling the separation mark 104 to be positioned on the tag 101 and the data 102, and completing construction of an RDMA transmission data segment; after the construction is completed, the memory 103 is registered as an RDMA memory; generating an RDMA message of the label data; and sending the RDMA message; thus, in these RDMA messages, in fact, all or part of the data of the tag 101, the data 102 and the compartment identifier 104 are included; all RDMA messages collectively carry the entire contents of the tag 101, separator id 104, and data 102.
In some of the above preferred embodiments, a preferred implementation manner is further provided, including applying for the free memory 103 by the DMA engine, and copying the data 102 and the tag 101 to adjacent locations of the free memory 103 by the DMA engine to implement concatenation of the two.
In some of the above preferred embodiments, the RDMA data transfer, among others, is single-sided RDMA; the basic semantic operations of single-sided RDMA generally include: two basic voice operation modes of RDMA read operation and RDMA read operation; therefore, the RDMA data transmission can adopt RDMA read operation and RDMA write operation. Compared with the double-side RDMA, in an effective communication process, the single-side RDMA can obviously reduce the message interaction times of two communication ends, and further improve the overall communication efficiency.
Other preferred embodiments of the present invention provide a method for receiving data, which is applied to a destination host in a cross-end computer communication system, and in particular, to RDMA transmission of tag data, and is capable of receiving an RDMA packet including tag data (i.e., tag and data corresponding to each other), and parsing and obtaining the transmitted tag and data therefrom. The method comprises the following steps:
for the received tag data, specifically, receiving all the RDMA messages thereof to obtain a complete data segment including the tag data, namely, an RDMA transmission data segment sent by the source host end; similarly, the received RDMA transfer segment is also stored in an address-contiguous memory, and the RDMA transfer segment includes: transmitted labels, data and separation marks between the two;
the separation mark is firstly identified by utilizing the separation mark, and then the transmitted label and data adjacent to the separation mark are obtained so as to provide the related application access or call for the destination host terminal.
In some of the above preferred embodiments, there is further provided a preferred implementation manner, and the specific implementation process may be:
in parsing tag data, that is, parsing the RDMA transfer data segment, a specific process is shown in fig. 2, and includes: traversing the RDMA transmission data segment (stored in the memory 201), identifying the separation identifier 104 therein, obtaining the memory offset thereof, further obtaining the memory offset of the transmitted tag 101 and the data 102 adjacent to the RDMA transmission data segment, and respectively obtaining the corresponding tag 101 and the data 102 according to the memory offset, and further providing the corresponding application access or call to the destination host.
Still other preferred embodiments of the present invention provide a method for RDMA-based tag data transmission, which is particularly applicable to RDMA transmission of tag data, and the system includes a source host-side device and a destination host-side device; the source host end device is used for sending the label data, and the destination host end device is used for receiving the label data. The method comprises the following steps:
for data and its corresponding tag that the source host side requests to be transmitted across the sides,
the method for transmitting data described in any of the above embodiments is performed at the source host,
and correspondingly, the method for receiving data described in any of the above embodiments is executed on the destination host.
Fig. 3 is a schematic flow chart of a method for RDMA-based tag data transmission according to one of the above preferred embodiments. As shown in fig. 3, the transmission process of the tag data, taking the data 102 and the tag 101 corresponding to the data as an example, includes:
at the end of the source host computer,
s101, inserting a separation mark 104 between data 102 and a label 101, applying for a free memory 103 with the same size as (sum of) the data 102, the separation mark 104 and the label 101 and continuous addresses, copying the label 101, the separation mark 104 and the data 102 to the free memory 103 for splicing, and constructing an RDMA transmission data segment;
s102 registers the memory 103 (namely the memory corresponding to the RDMA transmission data segment) as an RDMA memory;
s103, generating an RDMA message of the label data; the RDMA packet includes all or part of the data including the tag 101, the separation identifier 104, and the data 102; all RDMA messages load all contents of the label 101, the separation mark 104 and the data 102;
s104, sending the RDMA message;
at the end of the destination host computer,
s201, receiving all RDMA messages, and acquiring a data segment of label data including the label 101, the separation identifier 104 and the data 102, namely an RDMA transmission data segment;
s202 traverses the parsing and retrieving of the tag 101, data 102 from the RDMA transfer data segment according to the separation identifier 104 for providing to the relevant application access or call at the destination host side.
It is emphasized that the method provided by the present invention in constructing the RDMA transfer data segment includes, but is not limited to, the tag-ahead case in the previously described embodiments in this segment.
Still other preferred embodiments of the present invention provide an apparatus for RDMA tagging data messaging, the apparatus comprising: an RDMA network card, a processor, and a memory; wherein the memory stores a computer program operable on the processor; and when the processor executes the computer program, the processor and the RDMA network card can jointly execute the method for sending data according to any one of the embodiments.
Still other preferred embodiments of the present invention provide an apparatus for RDMA packet reception of tag data, the apparatus comprising: an RDMA network card, a processor, and a memory; wherein the memory stores a computer program operable on the processor; and when the processor executes the computer program, the processor and the RDMA network card can jointly execute the method for receiving data according to any one of the embodiments.
Still other preferred embodiments of the present invention provide a computer network system, comprising: a plurality of RDMA message sending devices according to any of the above embodiments; and a plurality of RDMA message receiving devices according to any of the above embodiments; and they are connected to each other through an RDMA network. In addition, in the real deployment of the computer network system, the same computer can be used as the RDMA message sending device, i.e. the source host end; or may also be used as a receiving device for RDMA packets sent by other source host devices, that is, the device for receiving RDMA packets according to any of the above embodiments.
Still other preferred embodiments of the present invention provide a computer-readable storage medium having stored therein code for performing tag data transmission, comprising: instructions for performing the method operations for sending data as described in any of the above embodiments, and/or instructions for the method operations for receiving data as described in any of the above embodiments, or instructions for the RDMA-based tag data transfer method operations as described in any of the above embodiments.
It should be noted that the memory mentioned in the above embodiments includes, but is not limited to, a memory in a narrow sense (i.e. a memory provided by a memory card in a computer system), a memory of a video card (often referred to as a video memory for short), and the like. Firstly, use
The above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto.
Claims (10)
1. A method for sending data, the method being applied to RDMA transfer of tag data at a source host, the method comprising:
for any request cross-end transmitted data and a corresponding label thereof, copying the data and the label to a memory with continuous addresses, and splicing the data and the label to construct an RDMA transmission data segment which can be effectively identified and analyzed at a destination host end; wherein the RDMA transfer data segment comprises: the label, the data and a separation mark between the label and the data;
registering a memory corresponding to the RDMA transmission data segment as an RDMA memory;
generating an RDMA message of the tag data;
and sending the RDMA message.
2. The method of claim 1, wherein the method comprises:
and applying for the memory with continuous addresses through a DMA engine, and executing the copying of the data and the tags in the construction of the RDMA transmission data segment.
3. The method of claim 1, wherein the method comprises:
the RDMA data transmission is single-side RDMA;
which comprises the following steps: a read operation or a write operation.
4. A method for receiving data, the method being applied to RDMA transfer of tag data at a destination host, the method comprising:
with respect to any one of the received tag data,
receiving all RDMA messages to obtain complete label data; wherein, the tag data is an RDMA transmission data segment sent by a source host end; the RDMA transfer data segment comprises: transmitted labels, data and separation marks between the two;
and analyzing the label data, and acquiring the transmitted label and data by using the separation mark.
5. The method of claim 4, wherein the method comprises:
the parsing of the tag data includes:
traversing the RDMA transmission data segment, identifying the separation mark therein, and respectively acquiring the corresponding label and data in the RDMA transmission data segment according to the memory offset.
6. An RDMA-based tag data transfer method applied to RDMA transfer of tag data of a cross-end communication system of computers, the system including a source host-end device and a destination host-end device, the method comprising:
for any data requesting a cross-peer transfer and its corresponding tag,
method for transmitting data according to any of claims 1 to 3, carried out at the source host end
And at the destination host side, performing the method of receiving data as claimed in any one of claims 4 to 5.
7. An apparatus for RDMA tag data messaging, comprising:
an RDMA network card, a processor, and a memory; wherein the content of the first and second substances,
the memory stores a computer program operable on the processor;
the processor, when executing the computer program, is capable of performing the method of transmitting data of any of claims 1-3 in conjunction with the RDMA network card.
8. An apparatus for RDMA packet reception of tag data, comprising:
an RDMA network card, a processor, and a memory; wherein the content of the first and second substances,
the memory stores a computer program operable on the processor;
the processor, when executing the computer program, being capable of performing the method of receiving data of any of claims 4-5 in conjunction with the RDMA network card.
9. A computer network system, comprising:
a number of the RDMA messaging devices of claim 7;
and a plurality of RDMA message receiving devices of claim 8;
they are connected to each other through RDMA networks.
10. A computer-readable storage medium having stored thereon code for performing tag data transmission, comprising: instructions for performing the method operations of transmitting data of any of claims 1-3;
and/or instructions to perform the method operations of receiving data of any of claims 4-5;
or, the instructions of claim 6 to operate in an RDMA-based tag data transfer method.
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| US20070073915A1 (en) * | 2005-09-29 | 2007-03-29 | P.A. Semi, Inc. | Functional DMA |
| CN103262054A (en) * | 2010-12-13 | 2013-08-21 | 弗森-艾奥公司 | Apparatus, system, and method for auto-commit memory |
| US20140019572A1 (en) * | 2012-07-12 | 2014-01-16 | International Business Machines Corp. | Remote Direct Memory Access Socket Aggregation |
| CN109981480A (en) * | 2017-12-27 | 2019-07-05 | 华为技术有限公司 | A kind of data transmission method and the first equipment |
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