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HARDWAREASSISTED NETWORKING USING SCHEDULED TRANSFER PROTOCOL ON ...

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When the network interface card (NIC) receives a packet a hardware interrupt is ... network hardware and driver design that affect performance. ...

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HARDWAREASSISTED NETWORKING USING SCHEDULED TRANSFER PROTOCOL ON LINUXPage 1SHKTEKNIIKAN OSASTOTIETOTEKNIIKAN KOULUTUSOHJELMAHARDWAREASSISTED NETWORKINGUSING SCHEDULED TRANSFER PROTOCOLON LINUXTyn tekijPekka PietikinenTyn valvojaTino PyssysaloHyvksytty/2001ArvosanaPage 2Pietikinen P. (2001) Hardwareassisted Networking Using Scheduled TransferProtocol on Linux. Department of Electrical Engineering University of Oulu OuluFinland. Diploma thesis 78 p.ABSTRACTAs network speeds have increased the demands placed on protocol implementations have grown significantly. Gigabit Ethernet has made network speeds of 100MB/s possible on commodity hardware although achieving the full potential isdifficult. The two greatest problems seen on Gigabit Ethernet networks are thelarge number of hardware interrupts and unnecessary memory copies.This thesis studies the ways in which implementations of network protocolscan be optimized. An emphasis is placed on methods which offload some of theprotocol processing onto programmable network adapters.Scheduled Transfer Protocol (STP) is a new ANSI specified data transfer protocol which uses small control messages to preallocate buffers at the data destination before the data movement begins. This characteristic of the protocolreduces the state information required for protocol processing significantly andthus makes hardware accelerated implementations of the protocol that copy datadirectly between the user buffer and network interface considerably simpler thantraditional protocols such as TCP.Experimental results of STP performance are obtained by studying the STPimplementation for Linux 2.4 on Gigabit Ethernet and comparing the results toTCP.The results obtained in this thesis show that partially offloading protocol processing to an intelligent network interface reduces the CPU utilization considerably and makes it possible to utilize the full capabilities of future network technologies.Keywords: zerocopy networking interrupt mitigation networ ...

Source: www.ee.oulu.fi

 

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