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Message-ID: <AANLkTi=J=LS8+RJp_0yvEm8fs6WLTRvvyoKhHjcnnTmk@mail.gmail.com> Date: Fri, 30 Jul 2010 11:26:31 -0600 From: Jeffrey Merkey <jeffmerkey@...il.com> To: linux-kernel@...r.kernel.org Subject: Asymtopic Behavior in IP Hashing Performance All Kernels 2.6.28.10 and above With the cwgen.ko packet generator set to the following range of settings on a Compaw Presario 2200 laptop, I see the following performance behavior on system throughput: CURRENT http://open-cworthy-linux-packet-generator.googlecode.com/files/cwgen-07-29-2010.tar.gz REPOSITORIES http://code.google.com/p/open-cworthy-linux-packet-generator/ http://sourceforge.net/projects/cworthypktgen/ Interface: lo Mode: continuous IP Mode: Random Source/IP/Ports pktsize: 1500 Interpacket Gap Time: 0 ns runs at 89 megabytes per second throughput Interface: lo Mode: Continuous IP Mode: Static IP/Static Ports Source: 127.0.0.1 Dest 127.0.0.2 Range: 16 addresses pktsize: 1500 Interpacket Gap Time: 0 ns runs at 217 megabytes per second throughput There is a significant performance drop (to roughly 1/3) when large numbers of random IP addresses are routed through the IP stack. Utilization does not seem to vary much, but the routing throughput drops drastically. Jeff Merkey -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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