CN104407928A - Data transmission method and device - Google Patents
Data transmission method and device Download PDFInfo
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- CN104407928A CN104407928A CN201410659939.9A CN201410659939A CN104407928A CN 104407928 A CN104407928 A CN 104407928A CN 201410659939 A CN201410659939 A CN 201410659939A CN 104407928 A CN104407928 A CN 104407928A
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Abstract
The invention relates to a data transmission method and device. The method comprises the following steps that each memory page in at least one memory page of data to be transmitted is subjected to cyclic redundancy checking, and obtained cyclic redundancy checking values are stored in checking regions of each memory page; according to whether the cyclic redundancy checking values in the checking region of at least one memory page are identical or not, whether the data to be transmitted of each memory page of the at least one memory page is full-zero data or not is determined; if the condition that the data in each memory page is the full-zero data is determined, any one memory page in the at least one memory page is reserved, and the memory page total number of the at least one memory page is recorded; any one memory page is sent to receiving equipment, and in addition, the full-zero marking position and the memory page total number of the any one memory page are notified. The invention also discloses the corresponding device. When the technical scheme of the data transmission method and the data transmission device is adopted, the fast recognition of full-zero pages can be carried out, in addition, the waste of memory page resources is reduced, and the utilization rate of transmission bandwidth is improved.
Description
Technical field
The present invention relates to technical field of data processing, particularly relate to a kind of data transmission method and device.
Background technology
Full zero data refers to that the content in all memory pages of data is all zero data.Full zero data recognition methods main at present mainly contains two kinds:
First kind of way: compare with zero byte-by-byte for the data in the page, that is: from the start address of the page, take out a byte successively, its content and zero compared; If with zero is unequal, then terminate to compare, illustrate that this page is not full zero data; And if zero equal, then the subsequent address continued toward the page travel through, and compares with zero data, if the data of finding that there is and zero unequal, then terminates to travel through; If the end address and zero traversing the page is all equal always, then illustrate that the data in this page are full zero data.
The second way: the marker bit directly inquiring about full zero page face, that is: for full zero data, business software is when receiving data, and can mark these data is full zero data; Follow-up flow process, when processing data, is directly inquired about full zero flag position, if marker bit has been set to, then can be processed by full zero data; If be not set to, then press non-full zero data processing.
For the data in the page and the zero byte-by-byte method compared, although method comparison is simple, as long as need data to be processed excessive or too much, then the performance of data processing can be greatly affected, almost unacceptable.
For the method for inquiry full zero page face marker bit, although better performances, be all the situation in full zero page face for continuous multiple page, do not do special process, need page number according to actual needs to apply for, thus the waste of page resource can be caused.
In sum, how to identify complete zero page fast, and reduce the waste of memory pages resource, improving the utilization factor of transmission bandwidth, is current problem to be solved.
Summary of the invention
The invention provides a kind of data transmission method and device, to identify complete zero page fast, and reduce the waste of memory pages resource, improve the utilization factor of transmission bandwidth.
First aspect, provides a kind of data transmission method, comprising:
Cyclic redundancy check (CRC) is carried out to each page at least one page of data to be transmitted, the cyclic redundancy check value obtained is kept in the verification region of described each page, wherein, described each page comprises data storage areas and verification region, and described data to be transmitted is kept in described data storage areas;
Whether identical according to the described cyclic redundancy check value in the verification region of at least one page described, determine whether the data to be transmitted of each page of at least one page described is full zero data;
If determine, each page is full zero data, retains either memory page at least one page described, and the page sum of record at least one page described;
Send described either memory page to receiving equipment, and notify full zero flag position and the described page sum of described either memory page.
In the implementation that the first is possible, described verification region is DIF region, data integrity region.
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the second is possible, the seed carrying out described cyclic redundancy check (CRC) in each page is 0 or fixed value.
In conjunction with the implementation that the second of first aspect is possible, in the implementation that the third is possible, hardware circuit is adopted to carry out described cyclic redundancy check (CRC).
In conjunction with first aspect, in the 4th kind of possible implementation, described method also comprises:
If determine, one of them page at least one page described is not full zero data, sends at least one page described to described receiving equipment.
Second aspect, provides a kind of data transmission device, comprising:
Verification unit, for carrying out cyclic redundancy check (CRC) to each page at least one page of data to be transmitted, the cyclic redundancy check value obtained is kept in the verification region of described each page, wherein, described each page comprises data storage areas and verification region, and described data to be transmitted is kept in described data storage areas;
Determining unit, for whether identical according to the described cyclic redundancy check value in the verification region of at least one page described, determines whether the data to be transmitted of each page of at least one page described is full zero data;
Stick unit, if for determining that each page is full zero data, retains either memory page at least one page described, and the page sum of record at least one page described;
First transmitting element, for sending described either memory page to receiving equipment, and notifies full zero flag position and the described page sum of described either memory page.
In the implementation that the first is possible, described verification region is DIF region, data integrity region.
In conjunction with the first possible implementation of second aspect or second aspect, in the implementation that the second is possible, the seed carrying out described cyclic redundancy check (CRC) in each page is 0 or fixed value.
In conjunction with the implementation that the second of second aspect is possible, in the implementation that the third is possible, hardware circuit is adopted to carry out described cyclic redundancy check (CRC).
In conjunction with second aspect, in the 4th kind of possible implementation, described device also comprises:
Second transmitting element, if for determining that one of them page at least one page described is not full zero data, send at least one page described to described receiving equipment.
Visible, adopt a kind of data transmission method provided by the invention and device, by carrying out cyclic redundancy check (CRC) to each page of data to be transmitted, cyclic redundancy check (CRC) result is kept at the verification region of each page, whether the cyclic redundancy check value in the verification region of then more each page is identical, thus the quick identification in full zero page face can be carried out, and for the data to be transmitted of full zero page, any one page is only transmitted when transmitting, the waste of memory pages resource can be reduced, improve the utilization factor of transmission bandwidth.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schematic flow sheet of a kind of data transmission method that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the schematic diagram in data storage areas in memory pages and data integrity region;
Fig. 3 is the data layout schematic diagram in data integrity region;
A kind of schematic flow sheet of further refinement of data transmission method of Fig. 4 for providing the embodiment of the present invention shown in Fig. 1;
The structural representation of a kind of data transmission device that Fig. 5 provides for the embodiment of the present invention;
A kind of structural representation of further refinement of data transmission device of Fig. 6 for providing the embodiment of the present invention shown in Fig. 5.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, be the schematic flow sheet of a kind of data transmission method that the embodiment of the present invention provides, the method comprises the following steps:
Step S101, cyclic redundancy check (CRC) is carried out to each page at least one page of data to be transmitted, the cyclic redundancy check value obtained is kept in the verification region of described each page, wherein, described each page comprises data storage areas and verification region, and described data to be transmitted is kept in described data storage areas.
Page is within the storage system when there is data transfer, is used for preserving the memory headroom of data to be transmitted, and data to be transmitted may comprise multiple page.What store in traditional page is all data, namely whole page is all data storage areas, in the present embodiment, page is divided into data storage areas and verification region, verification region is for storing proof test value, and this verification region can be data integrity region (Data IntegrityField, DIF), as shown in Figure 2, be the schematic diagram in the data storage areas in memory pages and data integrity region.
DIF, by adding the mode of the information such as checking data to data, protects the integrality of data and consistance.DIF is mainly used to prevent and detect static data and destroys, and comprises the data corruption that hardware fault in data channel and software bug cause, and the error in data etc. that disk can not detect and correct.As shown in Figure 3, be the data layout schematic diagram of DIF, T10 definition standard DIF form be the DIF that normal data sector format adds 8 bytes, Guard:2 byte CRC check and; Application Tag (Meta Tag): the user-defined information relevant with application of 2 bytes may be the identification information of LUN or the Status Flag etc. of block; Ref Tag: the logical block addresses (Logical Block Address, LBA) being generally low 4 bytes.
Utilize cyclic redundancy check (CRC) (Cyclical Redundancy Check, CRC) algorithm, the seed of selected CRC is 0, first new according to the data genaration in page crc value, and newly-generated crc value is saved in the DIF region of the page.
Step S102, whether identical according to the described cyclic redundancy check value in the verification region of at least one page described, determine whether the data to be transmitted of each page of at least one page described is full zero data.
For identical fixed data, when CRC algorithm is selected, their crc value is consistent certainly.Such as our selected CRC seed is 0, then the crc value generated according to zero data is zero certainly, and whether we can be 0 according to the CRC of DIF, come whether identification data is fast full zero data.
Can be realized by hardware for the concrete execution generating CRC and check (CRC), the recognition speed in full zero page face can be improved so greatly.
Step S103, if determine, each page is full zero data, retains either memory page at least one page described, and the page sum of record at least one page described.
If identified as full zero data, then the page is reduced, only retain a page, other the page is all discharged, and record the page sum of these data.
In this example, selected CRC seed is 0, as long as in certain CRC be that a fixing value is just passable, data identical are like this exactly identical by the value that CRC algorithm calculates.
Step S104, sends described either memory page to receiving equipment, and notifies full zero flag position and the described page sum of described either memory page.
To receiving equipment transmission data, if data to be transmitted is full zero page face, then can only transmit either memory page, and notify that this page is full zero page face, and the sum of page.The transmission of this page can by sending transmission request (Request, REQ) to receiving equipment, REQ comprises this either memory page, if we find that these data are full zero page face, then in the mid-full zero flag position of REQ, and the sum in full zero page face can be recorded in REQ.
Further, refer to Fig. 4, for a kind of schematic flow sheet of further refinement of data transmission method provided the embodiment of the present invention shown in Fig. 1, with the embodiment shown in Fig. 1 unlike, the method also comprises step S205: if determine, one of them page at least one page described is not full zero data, sends at least one page described to described receiving equipment.
If the data of identifying processing are not full zero data, then do not carry out page reduction, carry out the process of follow-up business flow process by the page of normal application.
According to a kind of data transmission method provided by the invention, by carrying out cyclic redundancy check (CRC) to each page of data to be transmitted, cyclic redundancy check (CRC) result is kept at the verification region of each page, whether the cyclic redundancy check value in the verification region of then more each page is identical, thus the quick identification in full zero page face can be carried out, and for the data to be transmitted of full zero page, any one page is only transmitted when transmitting, the waste of memory pages resource can be reduced, improve the utilization factor of transmission bandwidth.
We describe only the scene transmitting full zero data above, this identifies that the disposal route of full zero page face and full zero data also adapts in other scene fast, such as, in the scene of resource reclaim, if resource reclaim software judges that receiving data is full zero data, then the application heap can accessed data carries out Free up Memory.Adopt the method for this programme can make full use of the acceleration function of hardware for DIF, identify full zero data fast, thus reach the object of saving CPU and software overhead.
Refer to Fig. 5, be the structural representation of a kind of data transmission device that the embodiment of the present invention provides, this device 1000 comprises:
Verification unit 11, for carrying out cyclic redundancy check (CRC) to each page at least one page of data to be transmitted, the cyclic redundancy check value obtained is kept in the verification region of described each page, wherein, described each page comprises data storage areas and verification region, and described data to be transmitted is kept in described data storage areas.
Page is within the storage system when there is data transfer, is used for preserving the memory headroom of data to be transmitted, and data to be transmitted may comprise multiple page.What store in traditional page is all data, namely whole page is all data storage areas, in the present embodiment, page is divided into data storage areas and verification region, verification region is for storing proof test value, and this verification region can be data integrity region (Data IntegrityField, DIF), as shown in Figure 2, be the schematic diagram in the data storage areas in memory pages and data integrity region.
DIF, by adding the mode of the information such as checking data to data, protects the integrality of data and consistance.DIF is mainly used to prevent and detect static data and destroys, and comprises the data corruption that hardware fault in data channel and software bug cause, and the error in data etc. that disk can not detect and correct.As shown in Figure 3, be the data layout schematic diagram of DIF, T10 definition standard DIF form be the DIF that normal data sector format adds 8 bytes, Guard:2 byte CRC check and; Application Tag (Meta Tag): the user-defined information relevant with application of 2 bytes may be the identification information of LUN or the Status Flag etc. of block; Ref Tag: the logical block addresses (Logical Block Address, LBA) being generally low 4 bytes.
Verification unit 11 utilizes CRC algorithm, and the seed of selected CRC is 0, first new according to the data genaration in page crc value, and newly-generated crc value is saved in the DIF region of the page.
Determining unit 12, for whether identical according to the described cyclic redundancy check value in the verification region of at least one page described, determines whether the data to be transmitted of each page of at least one page described is full zero data.
For identical fixed data, when CRC algorithm is selected, their crc value is consistent certainly.Such as our selected CRC seed is 0, then determining unit 12 determines that the crc value generated according to zero data is zero certainly, and whether determining unit 12 can be 0 according to the CRC of DIF, comes whether identification data is fast full zero data.
Can be realized by hardware for the concrete execution generating CRC and check (CRC), the recognition speed in full zero page face can be improved so greatly.
Stick unit 13, if for determining that each page is full zero data, retains either memory page at least one page described, and the page sum of record at least one page described.
If identify as full zero data, then stick unit 13 pairs of pages reduce, and only retain a page, other the page is all discharged, and record the page sum of these data.
In this example, selected CRC seed is 0, as long as in certain CRC be that a fixing value is just passable, data identical are like this exactly identical by the value that CRC algorithm calculates.
First transmitting element 14, for sending described either memory page to receiving equipment, and notifies full zero flag position and the described page sum of described either memory page.
First transmitting element 14, to receiving equipment transmission data, if data to be transmitted is full zero page face, then can only transmit either memory page, and notify that this page is full zero page face, and the sum of page.The transmission of this page can by sending REQ to receiving equipment, and REQ comprises this either memory page, if we find that these data are full zero page face, then in the mid-full zero flag position of REQ, and can record the sum in full zero page face in REQ.
Further, refer to Fig. 6, for a kind of schematic flow sheet of further refinement of data transmission device provided the embodiment of the present invention shown in Fig. 5, with the embodiment shown in Fig. 5 unlike, this device 2000 also comprises the second transmitting element 25: if for determining that one of them page at least one page described is not full zero data, send at least one page described to described receiving equipment.
If the data of determining unit 22 identifying processing are not full zero data, then do not carry out page reduction, carry out the process of follow-up business flow process by the page of normal application.
According to a kind of data transmission device provided by the invention, by carrying out cyclic redundancy check (CRC) to each page of data to be transmitted, cyclic redundancy check (CRC) result is kept at the verification region of each page, whether the cyclic redundancy check value in the verification region of then more each page is identical, thus the quick identification in full zero page face can be carried out, and for the data to be transmitted of full zero page, any one page is only transmitted when transmitting, the waste of memory pages resource can be reduced, improve the utilization factor of transmission bandwidth.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in instructions all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can use hardware implementing, or firmware realizes, or their array mode realizes.When implemented in software, above-mentioned functions can be stored in computer-readable medium or as the one or more instruction on computer-readable medium or code and transmit.Computer-readable medium comprises computer-readable storage medium and communication media, and wherein communication media comprises any medium being convenient to transmit computer program from a place to another place.Storage medium can be any usable medium that computing machine can access.As example but be not limited to: computer-readable medium can comprise random access memory (Random Access Memory, RAM), ROM (read-only memory) (Read-Only Memory, ROM), EEPROM (Electrically Erasable Programmable Read Only Memo) (Electrically ErasableProgrammable Read-Only Memory, EEPROM), read-only optical disc (Compact Disc Read-OnlyMemory, or other optical disc storage CD-ROM), magnetic disk storage medium or other magnetic storage apparatus, or the program code that can be used in carrying or storing the expectation with instruction or data structure form also can by any other medium of computer access.In addition.Any connection can be suitable become computer-readable medium.Such as, if software uses concentric cable, optical fiber cable, twisted-pair feeder, Digital Subscriber Line (Digital SubscriberLine, DSL) or the wireless technology of such as infrared ray, radio and microwave and so on from website, server or other remote source, so the wireless technology of concentric cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, wireless and microwave and so on be included in affiliated medium fixing in.As used in the present invention, dish (Disk) and dish (disc) comprise compression laser disc (CD), laser dish, laser disc, Digital Versatile Disc (DVD), floppy disk and Blu-ray Disc, the usual magnetic of its mid-game copy data, what dish then carried out optics with laser copies data.Combination above also should be included within the protection domain of computer-readable medium.
In a word, the foregoing is only the preferred embodiment of technical solution of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a data transmission method, is characterized in that, comprising:
Cyclic redundancy check (CRC) is carried out to each page at least one page of data to be transmitted, the cyclic redundancy check value obtained is kept in the verification region of described each page, wherein, described each page comprises data storage areas and verification region, and described data to be transmitted is kept in described data storage areas;
Whether identical according to the described cyclic redundancy check value in the verification region of at least one page described, determine whether the data to be transmitted of each page of at least one page described is full zero data;
If determine, each page is full zero data, retains either memory page at least one page described, and the page sum of record at least one page described;
Send described either memory page to receiving equipment, and notify full zero flag position and the described page sum of described either memory page.
2. the method for claim 1, is characterized in that, described verification region is DIF region, data integrity region.
3. method as claimed in claim 1 or 2, is characterized in that, the seed carrying out described cyclic redundancy check (CRC) in each page is 0 or fixed value.
4. method as claimed in claim 3, is characterized in that, adopts hardware circuit to carry out described cyclic redundancy check (CRC).
5. the method for claim 1, is characterized in that, also comprises:
If determine, one of them page at least one page described is not full zero data, sends at least one page described to described receiving equipment.
6. a data transmission device, is characterized in that, comprising:
Verification unit, for carrying out cyclic redundancy check (CRC) to each page at least one page of data to be transmitted, the cyclic redundancy check value obtained is kept in the verification region of described each page, wherein, described each page comprises data storage areas and verification region, and described data to be transmitted is kept in described data storage areas;
Determining unit, for whether identical according to the described cyclic redundancy check value in the verification region of at least one page described, determines whether the data to be transmitted of each page of at least one page described is full zero data;
Stick unit, if for determining that each page is full zero data, retains either memory page at least one page described, and the page sum of record at least one page described;
First transmitting element, for sending described either memory page to receiving equipment, and notifies full zero flag position and the described page sum of described either memory page.
7. device as claimed in claim 6, it is characterized in that, described verification region is DIF region, data integrity region.
8. device as claimed in claims 6 or 7, is characterized in that, the seed carrying out described cyclic redundancy check (CRC) in each page is 0 or fixed value.
9. device as claimed in claim 8, is characterized in that, adopts hardware circuit to carry out described cyclic redundancy check (CRC).
10. device as claimed in claim 6, is characterized in that, also comprise:
Second transmitting element, if for determining that one of them page at least one page described is not full zero data, send at least one page described to described receiving equipment.
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| CN201410659939.9A CN104407928A (en) | 2014-11-18 | 2014-11-18 | Data transmission method and device |
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| CN201410659939.9A CN104407928A (en) | 2014-11-18 | 2014-11-18 | Data transmission method and device |
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Cited By (1)
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| CN111881211A (en) * | 2020-07-24 | 2020-11-03 | 北京浪潮数据技术有限公司 | Method, system and equipment for synchronizing storage data and computer storage medium |
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