From: Pasi Savolainen <psavo@iki.fi>
To: linux-kernel@vger.kernel.org
Subject: Re: swapspace layout improvements advocacy
Date: Sat, 15 Jan 2005 08:55:08 +0000 (UTC) [thread overview]
Message-ID: <slrncuhmjb.19r.psavo@varg.dyndns.org> (raw)
In-Reply-To: 20050114225213.GA4841@ip68-4-98-123.oc.oc.cox.net
* Barry K. Nathan <barryn@pobox.com>:
> On Fri, Jan 14, 2005 at 02:55:27PM +0100, Tim Schmielau wrote:
>> 2.6 seems in due need of such a patch.
>>
>> I recently found out that 2.6 kernels degrade horribly when going into
>> swap. On my dual PIII-850 with as little as 256 mb ram, I can easily
> [snip]
>
> I haven't tried the patch in question (unless it's in any Fedora
> kernels), but I've noticed that the single biggest step to improve
> swapping performance in 2.6 is to use the CFQ scheduler, not the AS
> scheduler. (That's also why Red Hat/Fedora kernels use CFQ as the
> default scheduler.)
I've not tried the patch yet, but with 1G mem / 1G swap when I finally
hit the swap and quit the program that uses it (straw, gimp..), machine
will stop responding for 10-15sec.
I have 'elevator=cfq' in boot command and this is SMP. Last seen
yesterday when shutting down 2.6.10-rc2-mm4 to try out latest -mm.
I did vmstat runs a while ago, but didn't see anything really out of
line, maybe it didn't get data either (or I don't know what is normal).
--
Psi -- <http://www.iki.fi/pasi.savolainen>
prev parent reply other threads:[~2005-01-15 8:55 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-05 0:32 page migration patchset Ray Bryant
2005-01-05 2:07 ` Andi Kleen
2005-01-05 3:20 ` Ray Bryant
2005-01-05 18:41 ` Steve Longerbeam
2005-01-05 19:23 ` Ray Bryant
2005-01-05 23:00 ` Steve Longerbeam
2005-01-05 23:16 ` Ray Bryant
2005-01-05 20:55 ` Hugh Dickins
[not found] ` <41DC7EAD.8010407@mvista.com>
2005-01-06 14:43 ` Andi Kleen
2005-01-06 16:00 ` Ray Bryant
2005-01-06 17:50 ` Christoph Lameter
2005-01-06 19:29 ` Andi Kleen
2005-01-06 22:30 ` William Lee Irwin III
2005-01-06 23:08 ` Andrew Morton
2005-01-06 23:15 ` William Lee Irwin III
2005-01-06 23:21 ` Ray Bryant
2005-01-06 23:35 ` William Lee Irwin III
2005-01-06 23:53 ` Anton Blanchard
2005-01-07 0:06 ` William Lee Irwin III
2005-01-07 0:31 ` Andi Kleen
2005-01-06 23:43 ` Steve Longerbeam
2005-01-06 23:58 ` William Lee Irwin III
2005-01-11 15:38 ` Ray Bryant
2005-01-11 19:00 ` Steve Longerbeam
2005-01-11 19:30 ` Ray Bryant
2005-01-11 20:59 ` Steve Longerbeam
2005-01-12 12:35 ` Robin Holt
2005-01-12 18:12 ` Hugh Dickins
2005-01-12 18:45 ` Ray Bryant
2005-01-12 18:53 ` Andrew Morton
2005-01-14 13:55 ` swapspace layout improvements advocacy Tim Schmielau
2005-01-14 18:15 ` Andrew Morton
2005-01-14 22:52 ` Barry K. Nathan
2005-01-15 0:33 ` Alan Cox
2005-01-15 2:26 ` Tim Schmielau
2005-01-15 8:55 ` Pasi Savolainen [this message]
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