From: Mike Galbraith <efault@gmx.de>
To: Lee Revell <rlrevell@joe-job.com>
Cc: Con Kolivas <kernel@kolivas.org>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, ck@vds.kolivas.org
Subject: Re: [PATCH] mm: Implement swap prefetching tweaks
Date: Tue, 14 Mar 2006 07:40:03 +0100 [thread overview]
Message-ID: <1142318403.4583.14.camel@homer> (raw)
In-Reply-To: <1142139283.25358.68.camel@mindpipe>
On Sat, 2006-03-11 at 23:54 -0500, Lee Revell wrote:
> On Sat, 2006-03-11 at 08:51 +0100, Mike Galbraith wrote:
> > 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.
>
> echo 64 > /sys/block/hd*/queue/max_sectors_kb
>
> There is basically a straight linear relation between whatever you set
> this to and the maximum scheduling latency you see. It was developed to
> solve the exact problem you are describing.
<head-scratching>
Is it possible that you mean pci latency? I'm unable to measure any
scheduling latency > 5ms while pushing IO for all my little Barracuda
disk is worth. I _can_ generate mp3 player audio dropout though,
despite mp3 files living on a separate drive/controller.
-Mike
next prev parent reply other threads:[~2006-03-14 6:38 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-10 9:54 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
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 [this message]
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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