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DateFri, 10 Sep 2004 19:21:33 -0500
From"K.R. Foley" <>
SubjectRe: [patch] voluntary-preempt-2.6.9-rc1-bk12-R6
Lee Revell wrote:
> On Fri, 2004-09-10 at 09:28, Ingo Molnar wrote:
>
>>* Andrew Morton <akpm@osdl.org> 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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