Re: Netperf TCP_RR(loopback) 10% regression in 2.6.24-rc6, comparingwith 2.6.22

From: Rick Jones
Date: Fri Jan 11 2008 - 12:56:58 EST


The test command is:
#sudo taskset -c 7 ./netserver
#sudo taskset -c 0 ./netperf -t TCP_RR -l 60 -H 127.0.0.1 -i 50,3 -I 99,5 -- -r 1,1

A couple of comments/questions on the command lines:

*) netperf/netserver support CPU affinity within themselves with the global -T option to netperf. Is the result with taskset much different? The equivalent to the above would be to run netperf with:

./netperf -T 0,7 ...

The one possibly salient difference between the two is that when done within netperf, the initial process creation will take place wherever the scheduler wants it.

*) The -i option to set the confidence iteration count will silently cap the max at 30.

happy benchmarking,

rick jones
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