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Remote page access method for use in shared virtual memory system and network interface card

A network interface card and storage system technology, applied in memory systems, transmission systems, digital transmission systems, etc., can solve the problems of increasing overhead, reducing parallel computing efficiency, and computing and communication cannot be overlapped, so as to improve efficiency and reduce protocol processing The effect of spending

Active Publication Date: 2007-11-14
LOONGSON TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, the traditional remote page retrieval method needs to interrupt the remote host. After receiving the interrupt, the remote host stops the ongoing calculation and interrupts the service, so that calculation and communication cannot be overlapped, and the efficiency of parallel computing is reduced.
At the same time, the content of the page is encapsulated and copied in the form of a message, which adds additional overhead

Method used

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  • Remote page access method for use in shared virtual memory system and network interface card
  • Remote page access method for use in shared virtual memory system and network interface card

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] An exemplary virtual sharing system as shown in Figure 1 includes a source node 10 and a destination node 20, which have network interface cards 30 and 30' respectively, and the network interface cards 30 and 30' are interconnected through a switch 40. In a specific application, the switch 40 is implemented by Altera's FPGA chip EP20K200EFC484-2X.

[0029] In the present invention, the remote page fetching operation is mainly completed by the network interface card on the node. The logical structure of the network interface cards 30 and 30' is shown in FIG. 2 . In Fig. 2, the PCI interface controller 301 of the network interface card is connected with the PCI bus of the host computer, frame header analysis logic 302, message transmission operation logic 303, RDMA operation logic 304, virtual and real address conversion logic 3...

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Abstract

A long distance paging method and network interface card for virtual share storage system, which contains mapping the memory area in network interface card to virtual address space of user process, source node user process directly accessing network interface card, generating and sending long distance paging request message to network interface card of destination node which directly accessing the needed page and feeding back response message to source node network interface card which directly writing said page to memory area of source node, said network interface card is added with frame head analysis logic, RDMA operation logic and virtual / real address conversion, said invention can realize long distance paging operation without breaking off the current work of CPU by bidirection operation of user process and network interface card.

Description

technical field [0001] The invention relates to a computer system, more specifically, to a remote page fetching method for a virtual shared storage system. Background technique [0002] Due to the easy programming of the shared storage system (the same below), researchers consider implementing the programming mode of shared storage on multiple machines communicating with message passing, which is virtual shared storage. Virtual shared storage is also easy to program and because most virtual shared storage systems are implemented on clusters, it has a good performance-price ratio. Most virtual shared storage systems use pages as the sharing granularity. [0003] Remote page fetch means that a page fault signal is generated when a page fault occurs on the source node. When the signal handler finds that the shared virtual address is not within the address range of the source node, a remote page fetch request is generated. After receiving the page fetch request, the destination...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F12/10G06F15/167G06F13/14G06F12/1036H04L12/00
Inventor 史岗胡明昌尹宏达胡伟武唐志敏
Owner LOONGSON TECH CORP
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