Messages in this thread | | | Date | Fri, 22 Dec 2006 20:43:57 -0600 | From | "K.R. Foley" <> | Subject | Re: 2.6.19-rt14 slowdown compared to 2.6.19 |
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Chen, Tim C wrote: > Ingo, > > We did some benchmarking on 2.6.19-rt14, compared it with 2.6.19 > kernel and noticed several slowdowns. The test machine is a 2 socket > woodcrest machine with your default configuration. > > Netperf TCP Streaming was slower by 40% ( 1 server and 1 client > each bound to separate cpu cores on different socket, network > loopback mode was used). > > Volanomark was slower by 80% (Server and Clients communicate with > network loopback mode. Idle time goes from 1% to 60%) > > Re-Aim7 was slower by 40% (idle time goes from 0% to 20%) > > Wonder if you have any suggestions on what could cause the slowdown. > We've tried disabling CONFIG_NO_HZ and it didn't help much. > > Thanks. > > Tim
Take a look at this. Not sure if this is the same problem but it looks like a candidate. I can definitely say that some latencies I have seen in my recent testing have gone away in the last few versions 2.6.20-rc1-rt{3,4}.
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