From: Helge Hafting <helgehaf@idb.hist.no>
To: Andrew Morton <akpm@zip.com.au>, linux-kernel@vger.kernel.org
Subject: Re: 2.4.14-pre6
Date: Fri, 02 Nov 2001 09:00:26 +0100 [thread overview]
Message-ID: <3BE2529A.63B1C366@idb.hist.no> (raw)
In-Reply-To: message from Linus Torvalds on Wednesday October 31, <Pine.LNX.4.33.0110310809200.32460-100000@penguin.transmeta.com> <15329.8658.642254.284398@notabene.cse.unsw.edu.au> <3BE1B6CD.7DA43A6C@zip.com.au>
Andrew Morton wrote:
> Another potential microoptimisation would be to write out
> clean blocks if that helps merging. So if we see a write
> for blocks 1,2,3,5,6,7 and block 4 is known to be in memory,
> then write it out too. I suspect this would be a win for
> ATA but a loss for SCSI. Not sure.
>
A not to stupid disk would implement the seek to block 5
as waiting for block 4 to move past. So
rewriting block 4 probably wouldn't help. could be
interesting to see a benchmark for that though, perhaps
some drives are really dumb.
The average "half rotation delay" when seeking does not apply
when the seek _isn't_ random.
Helge Hafting
next prev parent reply other threads:[~2001-11-02 8:01 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-31 16:15 2.4.14-pre6 Linus Torvalds
2001-10-31 18:36 ` 2.4.14-pre6 Andrew Morton
2001-10-31 19:06 ` 2.4.14-pre6 Linus Torvalds
2001-11-01 10:20 ` 2.4.14-pre6 Neil Brown
2001-11-01 20:55 ` 2.4.14-pre6 Andrew Morton
2001-11-01 21:28 ` 2.4.14-pre6 Chris Mason
2001-11-02 8:00 ` Helge Hafting [this message]
2001-11-04 22:34 ` 2.4.14-pre6 Pavel Machek
2001-11-04 23:16 ` 2.4.14-pre6 Daniel Phillips
-- strict thread matches above, loose matches on Subject: below --
2001-10-31 8:00 2.4.14-pre6 Linus Torvalds
2001-10-31 9:10 ` 2.4.14-pre6 Andrew Morton
2001-10-31 9:29 ` 2.4.14-pre6 Jens Axboe
2001-10-31 9:30 ` 2.4.14-pre6 bert hubert
2001-10-31 19:27 ` 2.4.14-pre6 Michael Peddemors
2001-10-31 19:38 ` 2.4.14-pre6 Linus Torvalds
2001-10-31 19:55 ` 2.4.14-pre6 Mike Castle
2001-10-31 20:02 ` 2.4.14-pre6 Rik van Riel
2001-10-31 23:18 ` 2.4.14-pre6 Erik Andersen
2001-10-31 23:40 ` 2.4.14-pre6 Dax Kelson
2001-10-31 23:57 ` 2.4.14-pre6 Michael Peddemors
2001-10-31 19:52 ` 2.4.14-pre6 Philipp Matthias Hahn
2001-10-31 21:05 ` 2.4.14-pre6 H. Peter Anvin
2001-11-01 19:14 ` 2.4.14-pre6 Pozsar Balazs
2001-11-02 12:01 ` 2.4.14-pre6 Pavel Machek
2001-11-05 20:43 ` 2.4.14-pre6 Charles Cazabon
2001-11-05 20:49 ` 2.4.14-pre6 Linus Torvalds
2001-11-05 21:27 ` 2.4.14-pre6 Josh Fryman
2001-11-05 19:04 ` 2.4.14-pre6 Gérard Roudier
2001-11-05 21:04 ` 2.4.14-pre6 Johannes Erdfelt
2001-11-05 21:08 ` 2.4.14-pre6 Wilson
2001-11-02 16:48 ` 2.4.14-pre6 jogi
2001-11-03 12:47 ` 2.4.14-pre6 Mike Galbraith
2001-11-03 18:01 ` 2.4.14-pre6 Linus Torvalds
2001-11-03 19:07 ` 2.4.14-pre6 Mike Galbraith
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