From: "Stephen C. Tweedie" <sct@redhat.com>
To: Drago Goricanec <drago@king.otsd.ts.fujitsu.co.jp>
Cc: H.H.vanRiel@phys.uu.nl, Billy.Harvey@thrillseeker.net,
sct@redhat.com, linux-mm@kvack.org,
linux-kernel@vger.rutgers.edu
Subject: Re: [PATCH] swapin readahead and fixes
Date: Wed, 9 Dec 1998 11:58:00 GMT [thread overview]
Message-ID: <199812091158.LAA01234@dax.scot.redhat.com> (raw)
In-Reply-To: <199812090241.LAA15658@fireball.otsd.ts.fujitsu.co.jp>
Hi,
On Wed, 09 Dec 1998 11:41:52 +0900, Drago Goricanec
<drago@king.otsd.ts.fujitsu.co.jp> said:
>> If we write this way (no more expensive than normal because
>> we write the stuff in one disk movement) swapin readahead
>> will be much more effective and performance will increase.
> Except for disk I/O bound processes, where the swapout writeahead
> steals some extra time from the disk.
Not necessarily: having to do extra seeks hurts the throughput MUCH
more than doing a bit more IO when the disk head is already in position.
> I guess this is where having separate swap and data disks would
> help.
That is _always_ a good idea, anyway.
--Stephen
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next prev parent reply other threads:[~1998-12-09 12:12 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-03 17:56 Rik van Riel
1998-12-04 11:34 ` Stephen C. Tweedie
1998-12-04 14:02 ` Rik van Riel
1998-12-04 14:34 ` Stephen C. Tweedie
1998-12-05 9:46 ` Gerard Roudier
1998-12-07 16:50 ` Stephen C. Tweedie
1998-12-08 1:34 ` Billy Harvey
1998-12-08 2:31 ` Rik van Riel
1998-12-08 2:51 ` Billy Harvey
1998-12-08 3:00 ` Rik van Riel
1998-12-08 12:35 ` Stephen C. Tweedie
1998-12-08 13:51 ` Rik van Riel
1998-12-09 2:41 ` Drago Goricanec
1998-12-09 11:58 ` Stephen C. Tweedie [this message]
1998-12-08 12:21 ` Stephen C. Tweedie
1998-12-05 10:47 ` Gerard Roudier
1998-12-04 19:25 ` Chris Evans
1998-12-04 20:47 ` Rik van Riel
1998-12-05 18:59 ` Alan Cox
1998-12-05 19:02 ` Rik van Riel
1998-12-06 5:20 ` Rik van Riel
1998-12-06 5:23 ` Steve VanDevender
1998-12-07 11:52 ` Rik van Riel
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