Re: Help understanding slow down

William Lee Irwin III
2004-05-24T01:06:34Z

On Sun, May 23, 2004 at 05:57:51PM -0700, Phy Prabab wrote:
> Just for more clarification, here is a perfect
> example:
> 2.6.7-p1:
> 24.86user 51.77system 2:58.87elapsed 42%CPU
> (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (13major+7591686minor)pagefaults
> 0swaps
> 2.4.21:
> 28.68user 34.98system 1:12.34elapsed 87%CPU
> (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (5691267major+1130523minor)pagefaults
> 0swaps

Thanks. This reveals that the performance regression is system time.
Could you please rerun the 2.6.7-rc1 test with kernel profiling on,
and reset the profile buffer prior just prior to the run?

This is the kernel command line option profile=1, and then as root,
echo 1 > /proc/profile just prior to the run.

-- wli