Messages in this thread |  | | | Date | Wed, 15 Aug 2001 07:06:22 -0400 | | From | Marc Heckmann <> | | Subject | Re: 2.4.8-pre7: still buffer cache problems[+2.4.9-pre3 comments] |
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On Thu, Aug 09, 2001 at 08:20:32PM -0400, marc heckmann wrote: > > > > OK, there is no obvious way to do do drop-behind on > > buffer cache pages, but I think we can use a quick > > hack to make the system behave well under the presence > > of large amounts of buffer cache pages. > > > > What we could do is, in refill_inactive_scan(), just > > moving buffer cache pages to the inactive list regardless > > of page aging when there are too many buffercache pages > > around in the system. > > > > Does the patch below help you ? > > well, the buffer cache still got huge and the system still swapped out like > mad, but it seemed like the buffer cache grew _slower_ and that the vm was > more fair towards other vm users. so interactivity was better but still far > from 2.2. and then it oops'ed [I don't think it was because of your patch > though..]: >
I tried 2.4.8 final and it fixes the problem.... could it be the fs/buffer.c changes? behaviour is now like 2.2 (good in this case). if I have time I'll try 2.4.8-ac5 to se if it also fixes it. thanks to whoever is responsible for the fix. also I tried 2.4.9-pre3 and it performs _much_ [I'd say 10 times better!] better under high VM load specifically when filling all ram+swap. Where 2.4.8 used to thrash without making any progress what so ever [I'd have to reset], 2.4.9-pre3 will either oom_kill (the _right_ process) or manage to handle swap to let processes run without thrashing. this is all on PPC without any highmem (192Mb + 200mb swap.).
Cheers,
-marc
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