Messages in this thread | | | From | Haar János <> | Subject | Re: swapper: page allocation failure. | Date | Sun, 21 May 2006 15:58:38 +0200 |
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----- Original Message ----- From: "Nick Piggin" <nickpiggin@yahoo.com.au> To: "Chris Wedgwood" <cw@f00f.org> Cc: "Haar J?nos" <djani22@netcenter.hu>; <linux-kernel@vger.kernel.org> Sent: Sunday, May 21, 2006 2:01 PM Subject: Re: swapper: page allocation failure.
> Chris Wedgwood wrote: > > On Sun, May 21, 2006 at 11:31:12AM +0200, Haar J?nos wrote: > > > > > >>[root@st-0001 /]# uname -a > >>Linux st-0001 2.6.17-rc3-git1 #2 SMP Sun May 21 01:12:22 CEST 2006 i686 i686 i386 GNU/Linux > > > > > > did earlier kernels work OK? > > > > > >>This is a simple disk node. > >>It serves the md0 array, and uses mem for buffering-caching. > > > > > > odd, i looks like you've leaked alot of lowmem but i can't think why > > > > i've got major (induced) brain-fog right now so i'll have to think > > about it tomorrow sorry > > The buffers are buffercache rather than the usual pagecache; due to > nbd I guess. Buffercache cannot be satisfied by highmem. > > This would be a relatively uncommon setup, which explains why it > isn't working 100%. I don't know of any reason why reclaim speed > should be worse for buffercache, however one notable thing will be > that zone_normal's lowmem reserve that is untouchable by pagecache > will be eaten by buffercache... > > Anyway, increasing /proc/sys/vm/min_free_kbytes should help. Janos, > perhaps you could try doubling it and see how you go?
I did it allready, and it looks like solves the problem. Yesterday i have more than 6 random reboots, and after i set from 3800 to 16000 the min free limit, i have none at this point. :-)
15:51:45 up 7:21, 1 user, load average: 0.85, 0.79, 0.67
Anyway, i interested about cache/buffer mechanism, because i have some performance problems too, and i can see, these systems wastes the half of memory instead of speeds up the operation.
Thanks, Janos
> > -- > SUSE Labs, Novell Inc. > Send instant messages to your online friends http://au.messenger.yahoo.com
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