From: Nick Piggin <piggin@cyberone.com.au>
To: Andrew Morton <akpm@digeo.com>
Cc: Andrea Arcangeli <andrea@suse.de>,
reiser@namesys.com, jakob@unthought.net,
david.lang@digitalinsight.com, riel@conectiva.com.br,
ckolivas@yahoo.com.au, linux-kernel@vger.kernel.org,
axboe@suse.de
Subject: Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest]
Date: Mon, 10 Feb 2003 22:53:27 +1100 [thread overview]
Message-ID: <3E4792B7.5030108@cyberone.com.au> (raw)
In-Reply-To: 20030210034808.7441d611.akpm@digeo.com
Andrew Morton wrote:
>Andrea Arcangeli <andrea@suse.de> wrote:
>
>>It's the readahead in my tree that allows the reads to use the max scsi
>>command size. It has nothing to do with the max scsi command size
>>itself.
>>
>
>Oh bah.
>
>- *max_ra++ = vm_max_readahead;
>+ *max_ra = ((128*4) >> (PAGE_SHIFT - 10)) - 1;
>
>
>Well of course that will get bigger bonnie numbers, for exactly the reasons
>I've explained. It will seek between files after every 512k rather than
>after every 128k.
>
Though Andrea did say it is a "single threaded" streaming read.
That is what I can't understand. Movement of the disk head should
be exactly the same in either situation and 128K is not exactly
a pitiful request size - so it suggests a quirk somewhere. It
is not as if the disk has to be particularly smart or know a
lot about the data in order to optimise the head movement for
a load like this.
next prev parent reply other threads:[~2003-02-10 11:43 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-09 13:30 [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest Con Kolivas
2003-02-09 14:46 ` stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] Andrea Arcangeli
2003-02-10 3:13 ` Nick Piggin
2003-02-10 3:52 ` Rik van Riel
2003-02-10 4:44 ` Nick Piggin
2003-02-10 5:15 ` usbaudio.c 2.5.59 John
2003-02-10 7:26 ` stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] Andrea Arcangeli
2003-02-10 7:43 ` Nick Piggin
2003-02-10 3:42 ` Rik van Riel
2003-02-10 4:15 ` Rik van Riel
2003-02-10 4:19 ` David Lang
2003-02-10 4:29 ` Rik van Riel
2003-02-10 7:20 ` Andrea Arcangeli
2003-02-10 4:33 ` Andrew Morton
2003-02-10 4:47 ` Rik van Riel
2003-02-10 7:31 ` Andrea Arcangeli
2003-02-10 4:51 ` Jakob Oestergaard
2003-02-10 4:58 ` Nick Piggin
2003-02-10 5:10 ` Jakob Oestergaard
2003-02-10 6:06 ` Valdis.Kletnieks
2003-02-10 6:31 ` Jakob Oestergaard
2003-02-10 7:36 ` Andrea Arcangeli
2003-02-10 7:41 ` Nick Piggin
2003-02-10 8:08 ` Andrea Arcangeli
2003-02-10 8:19 ` Andrew Morton
2003-02-10 8:56 ` Andrea Arcangeli
2003-02-10 9:09 ` Andrew Morton
2003-02-10 9:14 ` Andrea Arcangeli
2003-02-10 10:07 ` Hans Reiser
2003-02-10 10:15 ` Andrea Arcangeli
2003-02-10 10:40 ` Nick Piggin
2003-02-10 11:10 ` Andrea Arcangeli
2003-02-10 11:21 ` Andrew Morton
2003-02-10 11:31 ` Andrea Arcangeli
2003-02-10 11:24 ` Nick Piggin
2003-02-10 11:39 ` Andrea Arcangeli
2003-02-10 11:45 ` Nick Piggin
2003-02-10 12:00 ` Andrea Arcangeli
2003-02-10 12:11 ` Nick Piggin
2003-02-10 12:22 ` Andrea Arcangeli
2003-02-10 12:36 ` Nick Piggin
2003-02-10 12:47 ` Andrea Arcangeli
2003-02-10 13:26 ` Rik van Riel
2003-02-10 11:48 ` Andrew Morton
2003-02-10 11:53 ` Nick Piggin [this message]
2003-02-10 12:10 ` Andrea Arcangeli
2003-02-10 12:14 ` Nick Piggin
2003-02-10 12:26 ` Andrea Arcangeli
2003-02-10 12:12 ` Andrew Morton
2003-02-10 12:25 ` Andrea Arcangeli
2003-02-10 12:27 ` Nick Piggin
2003-02-10 12:30 ` Andrea Arcangeli
2003-02-10 12:34 ` Nick Piggin
2003-02-10 12:43 ` Andrea Arcangeli
2003-02-10 12:55 ` Nick Piggin
2003-02-10 13:30 ` Rik van Riel
2003-02-11 19:13 ` Rod Van Meter
2003-02-10 12:09 ` Andrea Arcangeli
2003-02-10 12:17 ` Nick Piggin
2003-02-10 12:28 ` Andrea Arcangeli
2003-02-10 12:58 ` Hans Reiser
2003-02-10 13:18 ` Andrea Arcangeli
2003-02-10 20:14 ` Hans Reiser
2003-02-10 13:19 ` Nick Piggin
2003-02-10 14:49 ` stochastic fair queueing in the elevator [Re: [BENCHMARK] 2 Giuliano Pochini
2003-02-10 15:05 ` Andrea Arcangeli
2003-02-10 11:25 ` stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] Hans Reiser
2003-02-10 11:42 ` Andrew Morton
2003-02-10 13:00 ` Hans Reiser
2003-02-10 10:48 ` Andrew Morton
2003-02-10 10:55 ` Nick Piggin
2003-02-10 11:21 ` Andrea Arcangeli
2003-02-10 11:33 ` Andrew Morton
2003-02-10 11:43 ` Andrea Arcangeli
2003-02-10 11:39 ` Nick Piggin
2003-02-10 9:59 ` Hans Reiser
2003-02-10 10:06 ` Andrew Morton
2003-02-10 10:17 ` Hans Reiser
2003-02-10 10:39 ` Hans Reiser
2003-02-10 8:27 ` Nick Piggin
2003-02-10 9:02 ` Andrea Arcangeli
2003-02-10 9:18 ` Nick Piggin
2003-02-10 20:33 ` Kurt Garloff
2003-02-10 21:43 ` Rik van Riel
2003-02-10 5:01 ` Andrew Morton
2003-02-10 7:34 ` Andrea Arcangeli
2003-02-10 4:44 ` Rik van Riel
2003-02-10 7:31 ` Andrea Arcangeli
2003-02-10 7:17 ` Andrea Arcangeli
2003-02-10 7:39 ` Nick Piggin
2003-02-10 10:03 ` stochastic fair queueing in the elevator [Re: [BENCHMARK] 2 Giuliano Pochini
2003-02-10 16:23 ` stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] Pavel Machek
2003-02-11 11:49 ` Andrea Arcangeli
2003-02-11 12:43 ` Jens Axboe
2003-02-11 14:28 ` Jason Lunz
2003-02-11 14:41 ` Jens Axboe
2003-02-11 17:17 ` Jason Lunz
2003-02-11 20:19 ` Jens Axboe
2003-02-10 16:47 ` Pavel Machek
2003-02-11 11:01 ` Jens Axboe
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