Re: [patch] voluntary-preempt-2.6.9-rc1-bk12-R6

[K.R. Foley]

Lee Revell wrote:
> On Fri, 2004-09-10 at 09:28, Ingo Molnar wrote:
>
> > * Andrew Morton <akpm@xxxxxxxx> wrote:
> >
> >
> > > diff -puN mm/vmscan.c~swapspace-layout-improvements mm/vmscan.c
> > > --- 25/mm/vmscan.c~swapspace-layout-improvements	2004-06-03 21:32:51.087602712 -0700
> > > +++ 25-akpm/mm/vmscan.c	2004-06-03 21:32:51.102600432 -0700
>
> OK, Andrew's patch seems to be an improvement.  I can still cause
> unbounded latencies, but these only seem to happen when we fill all
> available RAM and swap space, at which point we start spending
> milliseconds at a time in scan_swap_map:

I see much improved performance so far. Been running for about 3 hours 
and the highest latency I've seen thus far is ~260 usec and that was 
mmap not swap. The highest latency I've seen from swapping is ~198 and 
we have been in and out of swap at least several times. The latency 
trace can be seen here:

http://www.cybsft.com/testresults/2.6.9-rc1-bk12-S0/latencytrace1.txt

kr
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