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Date: Sun, 18 Nov 2001 08:14:00 +0100 (CET)
From: Mike Galbraith <mikeg@wen-online.de>
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To: Andrea Arcangeli <andrea@suse.de>
cc: Arjan van de Ven <arjanv@redhat.com>, <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.>=13 VM/kswapd/shmem/Oracle issue (was Re: Google's mm
 problems)
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On Sun, 18 Nov 2001, Andrea Arcangeli wrote:

> On Sun, Nov 18, 2001 at 07:17:02AM +0100, Mike Galbraith wrote:
> > On Sat, 17 Nov 2001, Andrea Arcangeli wrote:
> >
> > > If all your hardware is PCI nobody will make an allocation from the
> > > ZONE_DMA classzone and so kswapd will never loop on the ZONE_DMA, as
> > > instead can happen with -ac as soon as the ZONE_DMA becomes unfreeable
> > > and under the low watermark (and "unfreeable" of course also means all
> > > anon not locked memory but no swap installed in the machine).
> >
> > We don't fallback to ZONE_DMA anymore?  (good)
>
> we still fallback on the ZONE_DMA, otherwise mem=17m wouldn't boot :)

(oops;)

> what we don't do is to try to balance the dma zone if nobody is asking
> memory explicitly from the dma zone [isa users].

Ah.. all clear.  Thanks.

	-Mike

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