Messages in this thread | | | Date | Fri, 30 Jul 2010 11:26:31 -0600 | Subject | Asymtopic Behavior in IP Hashing Performance All Kernels 2.6.28.10 and above | From | Jeffrey Merkey <> |
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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
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