CN113285891B - Bandwidth allocation device for overload network switching and related network switching device - Google Patents
Bandwidth allocation device for overload network switching and related network switching device Download PDFInfo
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- CN113285891B CN113285891B CN202010104919.0A CN202010104919A CN113285891B CN 113285891 B CN113285891 B CN 113285891B CN 202010104919 A CN202010104919 A CN 202010104919A CN 113285891 B CN113285891 B CN 113285891B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/78—Architectures of resource allocation
- H04L47/783—Distributed allocation of resources, e.g. bandwidth brokers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
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Abstract
The application relates to a bandwidth allocation device for overloaded network switching and a related network switching device. A bandwidth distribution apparatus comprising: a buffer device, a main scheduler, an overload scheduler, a multiplexer and a detection device. The buffer device is used for receiving first data units transmitted by a plurality of first ports and second data units transmitted by a plurality of second ports and outputting the data units. The main scheduler is used for scheduling the first data units so as to output the first data units in sequence. The overload scheduler is configured to schedule the second data units to sequentially output the second data units. The multiplexer is controlled by the main scheduler to select a first data unit output by the main scheduler and a second data unit output by the overload scheduler for output. The detection device is used for generating power related information, and the main scheduler controls the multiplexer according to the power related information.
Description
Technical Field
The present invention relates to an overload network switch, and more particularly, to a bandwidth allocation device and a network switch for dynamically allocating bandwidth based on hardware temperature and bandwidth utilization status.
Background
A network switch is a piece of hardware used to provide information exchange and data forwarding services to networked devices. With the current trend, networking devices have increasingly larger output/input bandwidths, and thus network switches will inevitably increase core routing bandwidth in order to meet overall bandwidth requirements. However, increasing the core routing bandwidth requires increasing the system operating frequency, which causes timing convergence problems in design. Therefore, in the prior art, there is an overload (overload) design, based on which a network switch has a core routing bandwidth smaller than the overall bandwidth of the served network devices, and serves a plurality of network devices on a port through a bandwidth allocation mechanism.
In an overloaded network switch, ports are classified into a line speed (line speed) port, and an overloaded (overload) port. For guaranteed line speed ports, the system will allocate enough core routing slots (time slots) to serve the networking devices on these ports, guaranteeing that its bandwidth requirements are fully met; for overloaded ports, the system will use the remaining core routing slots, as well as the idle slots, to service the networking devices on those ports.
Since the overloaded port can only use the bandwidth left after the line speed port is used, how to efficiently allocate the bandwidth becomes an important design issue for the overloaded network switch. The design concept of the existing overload network switch is to use the bandwidth of the core route as much as possible, thereby achieving the best efficiency. However, increasing the operating frequency to maximize the performance may increase the power consumption of the system, which may cause the hardware temperature to be too high, thereby causing the chip to malfunction or even be damaged, and finally affecting the stability of the system.
Disclosure of Invention
In view of the above, the present invention provides a bandwidth allocation mechanism for an overloaded network switch service, which allows an overloaded network switch to increase the utilization rate of the core routing bandwidth by referring to the actual transmission speed limit setting in addition to considering the maximum data transmission speed of the networking device when allocating the bandwidth. In addition, the bandwidth allocation mechanism of the present invention also considers the system power, and determines whether to adjust the core routing bandwidth according to the hardware temperature or voltage variation, thereby reducing the risk of overheating and achieving the balance between power consumption and performance.
One embodiment of the present invention provides a bandwidth allocation apparatus for a network switch. The bandwidth allocation device comprises: a buffer device, a main scheduler, an overload scheduler, a multiplexer, a rate measurement device and a detection device. The buffer device is used for receiving a plurality of first data units transmitted by a plurality of first ports and a plurality of second data units transmitted by a plurality of second ports and outputting the first data units and the second data units. The main scheduler is coupled to the buffer device and is configured to schedule the first data units so as to sequentially output the first data units. The overload scheduler is coupled to the buffer device and is configured to schedule the second data units so as to sequentially output the second data units. The multiplexer is coupled to the main scheduler and the overload scheduler and is controlled by the main scheduler to select the first data units output by the main scheduler and the second data units output by the overload scheduler for output. The speed measuring device is used for measuring the data transmission speeds corresponding to the first ports and the second ports, so as to generate data transmission speed information. The main scheduler controls the multiplexer according to the data transmission speed information, and the overload scheduler schedules the second data units according to the data transmission speed information. The detection device is used for generating power related information. Wherein the main scheduler controls the multiplexer according to the power related information.
An embodiment of the present invention provides a network switching apparatus. The network switching apparatus includes: the system comprises a plurality of first ports, a plurality of second ports, an input scheduling device, a routing device, an output scheduling device, a rate measuring device and a detecting device. The input scheduling device includes: a buffer, a main scheduler, an overload scheduler, and a multiplexer. The buffer device is used for receiving a plurality of first data units transmitted by a plurality of first ports and a plurality of second data units transmitted by a plurality of second ports and outputting the first data units and the second data units. The main scheduler is coupled to the buffer device and is configured to schedule the first data units so as to sequentially output the first data units. The overload scheduler is coupled to the buffer device and is configured to schedule the second data units so as to sequentially output the second data units. The multiplexer is coupled to the main scheduler and the overload scheduler and is controlled by the main scheduler to select the first data units output by the main scheduler and the second data units output by the overload scheduler for output. The speed measuring device is used for measuring the data transmission speeds corresponding to the first ports and the second ports, so as to generate data transmission speed information. The main scheduler controls the multiplexer according to the data transmission speed information, and the overload scheduler schedules the second data units according to the data transmission speed information. The detection device is used for generating power related information. Wherein the main scheduler controls the multiplexer according to the power related information. The routing device is coupled to the input scheduling device and used for carrying out routing processing according to the first data unit and the second data unit output by the input scheduling device. The output scheduling device is coupled to the routing device and used for transmitting the first data units and the second data units to the first ports and the second ports according to a routing processing result of the routing device.
Drawings
Fig. 1 shows an architecture diagram of a network switching apparatus according to an embodiment of the present invention.
Fig. 2 shows an architecture diagram of a bandwidth allocation apparatus according to an embodiment of the present invention.
Detailed Description
Please refer to fig. 1, which is an architecture diagram of a network switching device according to an embodiment of the present invention. The network switching device 100 has a plurality of ports 11, a plurality of devices 10 are connected to the network switching device 100 through the ports 11, and the network switching device 100 can provide services of information exchange and data transmission for the devices 10. The device 10 may be any electronic device with network communication capability, such as a personal computer, a notebook computer, a printer, an internet phone, and a network storage device.
The network switching apparatus 100 belongs to an overload architecture, and the port 11 includes a line speed (line rate) port and an overload port. The network switching device 100 schedules the bandwidth of the core route to ensure that the data transmission speed of each device 10 on the wire speed port 11 can reach the maximum output/input bandwidth; further, the network switching device 100 allocates the remaining core routing bandwidth to the devices 10 on the overloaded ports 11. The network switch 100 comprises a plurality of receiving end physical layer circuits 102, a plurality of transmitting end media access control layer circuits 104, an input bandwidth allocation device 103 (e.g., ingress Over Bandwidth Manager (OBM)), an output bandwidth allocation device 105 (e.g., egress OBM), and a routing device 108. Each port 11 is coupled to at least one receiving mac layer circuit 102 and at least one transmitting mac layer circuit 104. The receiving mac layer circuit 102 is configured to receive data units (e.g., packets) from a source device 10 and perform mac layer related processing thereon, and the sending mac layer circuit 104 receives packets routed by the routing device 108, performs mac layer related processing thereon, and forwards the packets to a destination device 10. The router 108 mainly provides packet routing function, i.e. directs the received packet to a specific sender mac layer 104 according to the target address recorded in the packet, so that the target device 10 can receive the packet.
In order to ensure that the devices 10 on the line-speed ports 11 can use their maximum output/input bandwidth and properly allocate the remaining core routing bandwidth to the devices 10 on the overloaded ports 11, the network switching device 100 needs to perform bandwidth management through the input bandwidth allocation means 103. The input bandwidth allocation device 103 determines which port 11 of the packet transmitted by the device 10 can be sent to the routing device 108 in each time slot for routing. Furthermore, the output bandwidth allocation device 105 can control the timing of the transmitting end MAC layer circuit 104 reading the packets.
Fig. 2 shows an architecture diagram of a bandwidth allocation apparatus according to an embodiment of the present invention, and the buffer management apparatus shown in the drawing can be used to implement the input bandwidth allocation apparatus 103 or the output bandwidth allocation apparatus 105 in fig. 1. As shown, the bandwidth allocation apparatus 200 includes a buffer device (buffer) 210, a main scheduler (main scheduler) 220, an overload scheduler (overload scheduler) 230, a multiplexer 240, a detection device 250, and a rate measurement device 260. The buffer device 210 is used for buffering the packets transmitted by the mac layer circuit 102 at the receiving end. Where packets are received from device 10 on guaranteed line-rate port 11, buffer 210 may forward such packets directly to main scheduler 220 (or may buffer such packets via a small buffer memory). In addition, when the packet comes from the device 10 on the overloaded port 11, the device 10 on the overloaded port 11 has a lower priority to use the core routing bandwidth, so the buffering device 210 will buffer such packet and wait for the overloaded scheduler 230 to process it. In addition, the buffer 210 also monitors the transmission status of the PORT 11 to generate a PORT EMPTY status (PORT _ EMPTY) message PORT _ EMPTY to notify the master scheduler 220 and the overload scheduler 230. When a port 11 does not transmit a packet to the buffer 210, the buffer 210 notifies the master scheduler 220 and the overload scheduler 230 to allocate the slot to the device 10 on the other port 11.
The purpose of the master scheduler 220 is to allocate bandwidth to the guaranteed line-speed ports 11, which primarily sets weights according to the maximum output/input bandwidth of the devices 10 on each guaranteed line-speed port 11, thereby allocating the use of core routing bandwidth by the guaranteed line-speed ports 11. Further, the master scheduler 220 schedules packets to be transmitted to the router device 108 such that the packets are scheduled for transmission in each time slot. On the other hand, the master scheduler 220 also limits the core routing bandwidth usage of the devices 10 on the overloaded port 11 according to the overall bandwidth requirement of the guaranteed wire-speed port 11. When the bandwidth allocation apparatus 200 serves the device 10 on the guaranteed linear speed port 11, the multiplexer 240 is controlled by the master scheduler 220 via a multiplexer control signal SEL, and the multiplexer 240 outputs the packet provided by the master scheduler 220 via the multiplexer control signal SEL, so that the routing device 108 can route the packet transmitted by the device 10 on the guaranteed linear speed port 11 instead. However, if the master scheduler 220 knows that the device 10 on the guaranteed linear speed PORT 11 currently allocated to the timeslot does not have a packet transmission requirement at a certain time point according to the PORT idle status message PORT _ EMPTY, it may make use of the timeslot and give up the core routing bandwidth at this time to the device 10 on the overloaded PORT 11. At this time, the multiplexer control signal SEL allows the multiplexer 240 to output the packet provided by the overload scheduler 230.
In order to improve the utilization of the core routing bandwidth, the bandwidth allocation mechanism of the present invention further refers to the data transmission speed information RATE _ INFO generated by the RATE measurement device 260 for each port 11 and the transmission speed LIMIT RATE _ LIMIT performed by the system for each port 11 to perform bandwidth allocation. In order to avoid that a certain device 10 occupies too much bandwidth, the network switching device 100 may add a specific RATE LIMIT to each port 11, and when the data transmission speed of the port reaches the transmission speed LIMIT RATE _ LIMIT, the network switching device 100 does not provide the packet switching service for the port 11.
In the bandwidth allocation mechanism of the present invention, master scheduler 220 relinquishes core routing bandwidth to overload scheduler 230 by controlling multiplexer 240 whenever one of the following conditions is met:
1. ensuring that the wire speed PORT 11 has no packet transmission requirement (refer to PORT idle status message PORT _ EMPTY);
2. securing the data transmission speed of the line-speed port 11 up to the default transmission RATE LIMIT (reference data transmission speed information RATE _ INFO and transmission speed LIMIT RATE _ LIMIT)
On the other hand, the overload scheduler 230 will schedule packets transmitted by a particular overloaded port 11 only if the following conditions are met:
1. the overloaded PORT 11 has a packet transfer requirement (refer to PORT idle status message PORT _ EMPTY);
2. the data transmission speed of the overloaded port 11 has not reached the default transmission RATE LIMIT (the reference data transmission speed information RATE _ INFO and the transmission speed LIMIT RATE _ LIMIT)
In addition, in the bandwidth allocation mechanism of the present invention, when the master scheduler 220 allocates the core routing bandwidth to the device 10 of the overloaded port 11, the power-related detection result is also included. The main scheduler 220 determines whether to allocate the core routing bandwidth to the overloaded port 11 according to the POWER _ INFO detection result output by the detection device 250. In embodiments of the present invention, the detection device 250 may be any type of temperature sensor or any type of voltage detector. When the detecting device 250 is a temperature sensor, it can detect whether the hardware temperature (e.g., the hardware temperature of the network switching device 100, the bandwidth allocating device 200, or the overloaded port 11) is too high. Also, when the main scheduler 220 determines that the temperature is too high according to the detection result POWER _ INFO, the main scheduler 220 may reduce the core routing bandwidth allocated to the overloaded port 11 by controlling the multiplexer 240. In one embodiment, the hardware temperature may be divided into several levels, and the higher the temperature level, the greater the master scheduler 220 may reduce the core routing bandwidth usage by devices 10 on the overloaded rank port 11. For example, the master scheduler 220 may adjust the packet output of the overload scheduler 230 for a period of time by controlling the multiplexer 240 based on the temperature level.
Furthermore, the rise of the hardware temperature is related to the load borne by the network switching device 100. The larger the load, the lower the supply voltage may be. Therefore, when the detecting device 250 is a voltage sensor, the detecting device 250 can determine whether the hardware is in an overload state by measuring an IR drop (IR drop) of the power voltage. When the main scheduler 220 determines that the hardware is overloaded according to the detection result POWER _ INFO, the main scheduler 220 may reduce the core routing bandwidth allocated to the overloaded port 11 by controlling the multiplexer 240. In one embodiment, the IR drop may also be divided into several levels, with the higher the level, the master scheduler 220 may reduce the core routing bandwidth usage by devices 10 on the overloaded rank port 11 to a greater extent. For example, the master scheduler 220 may adjust the packet output of the overload scheduler 230 for a period of time by controlling the multiplexer 240 based on the temperature level.
In a conventional overload architecture, the core bandwidth is often allocated by generating weights based only on the maximum output/input bandwidth of each overloaded port. However, in practical application, users often have additional restrictions on ports, such as: a transmission rate limit. Therefore, in the bandwidth allocation mechanism of the present invention, the bandwidth allocation is performed while considering the maximum output/input bandwidth of the overloaded port individually and the actual data transmission speed status. Therefore, the bandwidth allocation mechanism of the present invention can increase the chance of guaranteeing the wire speed port to give way of the core routing bandwidth to the overloaded port. And further limiting the overload ports which can participate in scheduling, thereby more reasonably allocating the core routing bandwidth, and ensuring that the overload ports which really need to be used can be allocated with more sufficient bandwidth, thereby improving the core routing utilization rate.
On the other hand, under the consideration of superior performance, the traditional overload architecture usually only uses the bandwidth of the core route, and allocates the residual bandwidth after the wire speed port is used to the overload port as much as possible. In contrast, the present invention further considers the impact of high dynamic power consumption that may result from increased core routing utilization, such as hardware overheating. Therefore, the bandwidth allocation mechanism of the present invention further dynamically adjusts the usage of the overloaded port for the core routing bandwidth through power-related detection, thereby reducing power consumption and temperature to ensure system stability.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
[ notation ] to show
10: device for measuring the position of a moving object
11: port(s)
100: network switching device
102: receiving end media access control layer circuit
103: input bandwidth allocation device
104: transmitting end media access control layer circuit
105: output bandwidth allocation device
108: routing device
200: bandwidth allocation device
210: buffer device
220: main stroke device
230: overload scheduler
240: multi-task device
250: detection device
260: a speed measuring device.
Claims (10)
1. A bandwidth allocation apparatus for a network switch, comprising:
a buffer device for receiving a plurality of first data units transmitted by a plurality of first ports and a plurality of second data units transmitted by a plurality of second ports and outputting the first data units and the second data units;
a main scheduler, coupled to the buffer device, for scheduling the first data units so as to output the first data units in sequence;
an overload scheduler, coupled to the buffer, for scheduling the second data units to sequentially output the second data units;
a multiplexer coupled to the master scheduler and the overload scheduler and controlled by the master scheduler to select the first data units output by the master scheduler and the second data units output by the overload scheduler for output;
a detection device for generating a power related information, wherein the main scheduler controls the multiplexer according to the power related information; and
a speed measuring device for measuring the data transmission speed corresponding to the first ports and the second ports, thereby generating data transmission speed information;
the main scheduler controls the multiplexer according to the data transmission speed information, and the overload scheduler schedules the second data units according to the data transmission speed information.
2. The apparatus of claim 1, wherein the overload scheduler schedules the second data units according to the power-related information.
3. The apparatus of claim 1, wherein the master scheduler controls the multiplexer to output one of the second data units when the data transmission rate information indicates that a data transmission rate corresponding to a specific first port has reached a transmission rate limit or the specific first port has not transmitted a first data unit to the buffer device.
4. The apparatus of claim 1, wherein the overload scheduler schedules the second data unit sent by a particular second port only if the data transmission rate information indicates that a data transmission rate corresponding to the particular second port does not meet a transmission rate limit and the particular second port sends the second data unit to the buffer device.
5. The apparatus of claim 1, wherein the detecting means comprises a temperature detector for detecting a temperature of hardware associated with at least one of the second ports to generate the power-related information.
6. The apparatus of claim 5, wherein the master scheduler controls the multiplexer according to a plurality of levels of the temperature.
7. The apparatus of claim 1, wherein the detecting means comprises a voltage detector for detecting a voltage associated with hardware of at least one of the second ports to generate the power-related information.
8. The apparatus of claim 7, wherein the master scheduler controls the multiplexer according to a plurality of levels of the voltage.
9. A network switching apparatus, comprising:
a plurality of first ports;
a plurality of second ports;
an input scheduling apparatus, comprising: a buffer, a main scheduler, an overload scheduler and a multiplexer; wherein the content of the first and second substances,
the buffer device is used for receiving a plurality of first data units transmitted by the first ports and a plurality of second data units transmitted by the second ports and outputting the first data units and the second data units;
the main scheduler is coupled to the buffer device and used for scheduling the first data units so as to output the first data units in sequence;
the overload scheduler is coupled to the buffer device and used for scheduling the second data units so as to output the second data units in sequence;
the multiplexer is coupled to the main scheduler and the overload scheduler, and is controlled by the main scheduler to select the first data units output by the main scheduler and the overload scheduler
The second data units output by the overload scheduler for outputting;
a detection device for generating a power related information, wherein the main scheduler controls the multiplexer according to the power related information;
a speed measuring device for measuring the data transmission speed corresponding to the first ports and the second ports to generate data transmission speed information;
a routing device, coupled to the input scheduling device, for performing routing processing according to the first data unit and the second data unit output by the input scheduling device;
an output scheduling device, coupled to the routing device, for transmitting the first data units and the second data units to the first ports and the second ports according to a routing processing result of the routing device;
the main scheduler can control the multiplexer according to the data transmission speed information, and the overload scheduler schedules the second data units according to the data transmission speed information.
10. The switching device of claim 9, wherein the overload scheduler schedules the second data units according to the power-related information.
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| US6687781B2 (en) * | 2001-05-01 | 2004-02-03 | Zettacom, Inc. | Fair weighted queuing bandwidth allocation system for network switch port |
| TWI221391B (en) * | 2002-03-27 | 2004-09-21 | Benq Corp | System and method for scheduling and transmitting protocol data units |
| CN100426792C (en) * | 2005-07-27 | 2008-10-15 | 华为技术有限公司 | Method for processing buffer storage weight in muticast scheduling |
| US20080285551A1 (en) * | 2007-05-18 | 2008-11-20 | Shamsundar Ashok | Method, Apparatus, and Computer Program Product for Implementing Bandwidth Capping at Logical Port Level for Shared Ethernet Port |
| TW201044819A (en) * | 2009-06-03 | 2010-12-16 | Ic Plus Corp | Bandwidth distribution apparatus for network switch and the constribution method thereof |
| CN103118134B (en) * | 2013-02-28 | 2015-09-02 | 浙江大学 | A kind of large Data dissemination method for guaranteeing quality of oriented mission level and device |
| US9992120B2 (en) * | 2015-10-21 | 2018-06-05 | Citrix Systems, Inc. | System and method for rate-based packet transmission over a network |
| US10686714B2 (en) * | 2018-04-27 | 2020-06-16 | Avago Technologies International Sales Pte. Limited | Traffic management for high-bandwidth switching |
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