Re: swapper: page allocation failure.

From: Haar János
Date: Sun May 21 2006 - 06:45:36 EST

----- Original Message -----
From: "Chris Wedgwood" <cw@xxxxxxxx>
To: "Haar J?nos" <djani22@xxxxxxxxxxxx>
Cc: <linux-kernel@xxxxxxxxxxxxxxx>
Sent: Sunday, May 21, 2006 12:24 PM
Subject: Re: swapper: page allocation failure.

> On Sun, May 21, 2006 at 11:31:12AM +0200, Haar J?nos wrote:
> > 1. why don't use highmem for caching?
> > 2. why can not allocate enough lowmem from shared-buffer for the e1000
> > driver if it needs some memory?
> highmem can't be used as freely as lowmem, it has additional
> complexity and a slight over head that makes it hard or impossible to
> use in many places

OK, i understand this, but buffer-cache is an optional thing, and looks like
really simple (for me), and i cannot understand why cannot use exactly for
buffering the highmem...

On my concentrator the nbd-client uses ~ 3.5GB of ram for PAGE-cache.
The buffer cache why can not use the highmem?
Whats the difference?


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