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Date: Fri, 18 Jun 2010 16:26:23 +0800 From: "Zhang, Yanmin" <yanmin.zhang@...el.com> To: "Shi, Alex" <alex.shi@...el.com>, "eric.dumazet@...il.com" <eric.dumazet@...il.com>, "davem@...emloft.net" <davem@...emloft.net> CC: "Chen, Tim C" <tim.c.chen@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: RE: TCP stream performance regression due to c377411f2494a931ff7facdbb3a6839b1266bcf6 More info about the testing: It's a loopback testing. We start one client netperf process to communicate with netserver process in a stream TCP testing. To reduce the cpu cache effect, we bind the 2 processes on 2 different physical cpus. #taskset -c 0 ./netserver #taskset -c 15 ./netperf -t TCP_STREAM -l 60 -H 127.0.0.1 -i 50,3 -I 99,5 -- -s 57344 -S 57344 -m 4096 >>-----Original Message----- >>From: Shi, Alex >>Sent: 2010年6月18日 15:17 >>To: eric.dumazet@...il.com; davem@...emloft.net >>Cc: Chen, Tim C; Zhang, Yanmin; linux-kernel@...r.kernel.org >>Subject: TCP stream performance regression due to >>c377411f2494a931ff7facdbb3a6839b1266bcf6 >> >>In our netperf testing, TCP_STREAM56 shows about 20% or more performance >>regression on WSM/NHM and tigerton machines. The testing boot up both >>netserver and client on localhost. The testing command like this: >>./snapshot_script_net TC_STREAM56 127.0.0.1 >> >>We found the following commit causes this issue. >>c377411f2494a931ff7facdbb3a6839b1266bcf6 >>Revert this commit will recover this regression on all machine. >> >>Regards! >>Alex
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