Messages in this thread | | | Date | Mon, 19 Jun 2006 09:40:29 -0700 | From | Harry Edmon <> | Subject | Re: Network performance degradation from 2.6.11.12 to 2.6.16.20 |
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Jesper Dangaard Brouer wrote: > >>> Harry Edmon <harry@atmos.washington.edu> wrote: >>> >>>> I have a system with a strange network performance degradation from >>>> 2.6.11.12 to most recent kernels including 2.6.16.20 and >>>> 2.6.17-rc6. The system is has Dual single core Xeons with >>>> hyperthreading on. > <cut> > > Hi Harry > > Can you check which "high-res timesource" you are using? > > In the kernel log look for: > kernel: Using tsc for high-res timesource > kernel: Using pmtmr for high-res timesource > > I have experinced some network performance degradation when using the > "pmtmr" timesource, on a Opteron AMD system. It seems that the > default timesource change between 2.6.15 to 2.6.16. > > If you use "pmtmr" try to reboot with kernel option "clock=tsc". > > On my Opteron AMD system i normally can route 400 kpps, but with > timesource "pmtmr" i could only route around 83 kpps. (I found the > timer to be the issue by using oprofile). > > We have CONFIG_HPET_TIMER=y, so we do not see these messages.
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