From: Hans Reiser <reiser@namesys.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Andrew Morton <akpm@digeo.com>,
piggin@cyberone.com.au, 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 15:58:13 +0300 [thread overview]
Message-ID: <3E47A1E5.6020902@namesys.com> (raw)
In-Reply-To: <20030210120916.GD31401@dualathlon.random>
Is the following a fair summary?
There is a certain minimum size required for the IOs to be cost
effective. This can be determined by single reader benchmarking. Only
readahead and not anticipatory scheduling addresses that.
Anticipatory scheduling does not address the application that spends one
minute processing every read that it makes. Readahead does.
Anticipatory scheduling does address the application that reads multiple
files that are near each other (because they are in the same directory),
and current readahead implementations (excepting reiser4 in progress
vaporware) do not.
Anticipatory scheduling can do a better job of avoiding unnecessary
reads for workloads with small time gaps between reads than readahead
(it is potentially more accurate for some workloads).
Is this a fair summary?
--
Hans
next prev parent reply other threads:[~2003-02-10 12:48 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
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 [this message]
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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