Jesper Dangaard Brouer wrote:
Harry Edmon <[EMAIL PROTECTED]> 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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