lkml.org 
[lkml]   [2008]   [Mar]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Poor PostgreSQL scaling on Linux 2.6.25-rc5 (vs 2.6.22)

* Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> > Just a quick suggestion, does a simple runtime tune like this fix
> > the workload:
> >
> > for N in /proc/sys/kernel/sched_domain/*/*/flags; do
> > echo $[`cat $N`|16] > N
> > done
> >
> > this sets SD_WAKE_IDLE for all the nodes in the scheduler domains
> > tree. (doing this results in over-agressive idle balancing - but if
> > this fixes your testcase it shows that we were balancing
> > under-agressively for this workload.) Thanks,
>
> It doesn't change anything.
>
> There is no idle time for this workload, btw.

oh, i thought you said that. Could you try to turn SD_WAKE_AFFINE
all-off and all-on perhaps, via the same scriptlet?

Ingo


\
 
 \ /
  Last update: 2008-03-11 11:01    [W:0.049 / U:3.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site