From: Mike Galbraith <efault@gmx.de>
To: Con Kolivas <kernel@kolivas.org>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, ck@vds.kolivas.org
Subject: Re: [PATCH] mm: Implement swap prefetching tweaks
Date: Sat, 11 Mar 2006 08:51:39 +0100 [thread overview]
Message-ID: <1142063500.7605.13.camel@homer> (raw)
In-Reply-To: <200603111824.06274.kernel@kolivas.org>
On Sat, 2006-03-11 at 18:24 +1100, Con Kolivas wrote:
> On Saturday 11 March 2006 17:00, Mike Galbraith wrote:
> > If you're creating a lot of traffic, I can see it causing problems. I
> > was under the impression that you were doing minimal IO and absolutely
> > trivial CPU. That's what didn't make sense to me to be clear.
>
> A lot of cpu would be easier to handle; it's using absolutely miniscule
> amounts of cpu. The IO is massive though (and seeky in nature), and reading
> from a swap partition seems particularly expensive in this regard.
There used to be a pages in flight 'restrictor plate' in there that
would have probably helped this situation at least a little. But in any
case, it sounds like you'll have to find a way to submit the IO in itty
bitty synchronous pieces.
-Mike
next prev parent reply other threads:[~2006-03-11 7:50 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-10 9:54 [PATCH] mm: Implement swap prefetching tweaks Con Kolivas
2006-03-10 22:35 ` Andrew Morton
2006-03-10 23:11 ` Peter Williams
2006-03-11 4:18 ` Con Kolivas
2006-03-11 4:28 ` Peter Williams
2006-03-11 4:34 ` Con Kolivas
2006-03-11 5:34 ` Peter Williams
2006-03-11 5:04 ` [ck] " Radoslaw Szkodzinski
2006-03-11 5:21 ` Con Kolivas
2006-03-11 5:46 ` Peter Williams
2006-03-11 3:50 ` Con Kolivas
2006-03-11 5:33 ` Mike Galbraith
2006-03-11 5:50 ` Con Kolivas
2006-03-11 5:58 ` Con Kolivas
2006-03-11 6:11 ` Mike Galbraith
2006-03-11 6:00 ` Mike Galbraith
2006-03-11 6:05 ` Mike Galbraith
2006-03-11 7:20 ` Con Kolivas
2006-03-11 7:44 ` Mike Galbraith
2006-03-11 8:16 ` Nick Piggin
2006-03-11 8:22 ` Mike Galbraith
2006-03-11 7:24 ` Con Kolivas
2006-03-11 7:51 ` Mike Galbraith [this message]
2006-03-11 8:15 ` Con Kolivas
2006-03-12 4:54 ` Lee Revell
2006-03-12 5:27 ` Mike Galbraith
2006-03-12 8:36 ` Con Kolivas
2006-03-14 6:40 ` Mike Galbraith
2006-03-14 6:50 ` Lee Revell
2006-03-14 7:06 ` Mike Galbraith
2006-03-14 8:44 ` Mike Galbraith
2006-03-14 8:05 ` [ck] " Jens Axboe
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