Re: swapper: page allocation failure.
From: Haar János
Date: Mon May 22 2006 - 11:09:28 EST
----- Original Message -----
From: "Con Kolivas" <kernel@xxxxxxxxxxx>
Cc: "Haar János" <djani22@xxxxxxxxxxxx>; "Nick Piggin"
Sent: Monday, May 22, 2006 1:17 PM
Subject: Re: swapper: page allocation failure.
> On Monday 22 May 2006 17:41, Haar János wrote:
> > ----- Original Message -----
> > From: "Nick Piggin" <nickpiggin@xxxxxxxxxxxx>
> > > Yeah, as I said, block device's pagecache (aka buffercache) can't
> > > use highmem. If nbd can export regular files as block devices, or
> > > you use loop devices from regular files, that might help (or slow
> > > things down :P).
> > Hmm.
> > That sounds bad.
> > I think, if highmem is unreachable some times that makes lowmem more
> > valuable!
> > The kernel needs to keep (reserve) it free as much as possible.
> > The buffer-cache is an unimportant thing next to keeping lowmem free,
> > it is blocks the performance and wastes the systems resources!
> > It is possible any workaround?
> Try with one of the alternative vmsplit options that gives you more
> That might break certain applications though.
total used free shared buffers cached
Mem: 4049724 4021196 28528 0 16384 3217288
Low: 4049724 4021196 28528
High: 0 0 0
-/+ buffers/cache: 787524 3262200
Swap: 0 0 0
This is an 64 bit machine, the "concentrator".
It looks like use all, the 4G ram as "lowmem".
If i replace the cpu on my nodes to 64bit capable ones, i can use all the
memory as buffer-cache? :-)
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