From: Andrew Morton <akpm@digeo.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Rik van Riel <riel@conectiva.com.br>,
Con Kolivas <conman@kolivas.net>,
linux kernel mailing list <linux-kernel@vger.kernel.org>,
marcelo@conectiva.com.br
Subject: Re: [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest
Date: Sun, 10 Nov 2002 12:52:07 -0800 [thread overview]
Message-ID: <3DCEC6F7.E5EC1147@digeo.com> (raw)
In-Reply-To: 20021110201045.GA4056@x30.random
Andrea Arcangeli wrote:
>
> > Whether the IO is synchronous or asynchronous shouldn't matter much,
>
> the fact the I/O is sync or async makes the whole difference. with sync
> reads the vmstat line in the read column will be always very small
> compared to the write column under a write flood. This can be fixed either:
>
> 1) with hacks in the elevator ala read-latency that are not generic and
> could decrease performance of other workloads
read-latency will only do the front-insertion if it was unable to find a
merge or insert on the tail-to-head search.
And the problem it desparately addresses is severe.
next prev parent reply other threads:[~2002-11-10 20:45 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-09 2:00 [BENCHMARK] 2.4.{18,19{-ck9},20rc1{-aa1}} with contest Con Kolivas
2002-11-09 2:36 ` Andrew Morton
2002-11-09 3:26 ` Con Kolivas
2002-11-09 4:15 ` Andrew Morton
2002-11-09 5:12 ` Con Kolivas
2002-11-09 11:21 ` Jens Axboe
2002-11-09 13:09 ` Con Kolivas
2002-11-09 13:35 ` Stephen Lord
2002-11-09 13:54 ` Jens Axboe
2002-11-09 21:12 ` Arador
2002-11-10 2:26 ` Andrea Arcangeli
2002-11-09 21:53 ` Con Kolivas
2002-11-10 10:09 ` Jens Axboe
2002-11-10 16:23 ` Andrea Arcangeli
2002-11-11 4:26 ` Con Kolivas
2002-11-10 10:12 ` Kjartan Maraas
2002-11-10 10:17 ` Jens Axboe
2002-11-10 16:27 ` Andrea Arcangeli
2002-11-09 11:20 ` Jens Axboe
2002-11-10 2:44 ` Andrea Arcangeli
2002-11-10 3:56 ` Matt Reppert
2002-11-10 9:58 ` Con Kolivas
2002-11-10 10:06 ` Jens Axboe
2002-11-10 16:21 ` Andrea Arcangeli
2002-11-10 16:20 ` Andrea Arcangeli
2002-11-10 19:32 ` Rik van Riel
2002-11-10 20:10 ` Andrea Arcangeli
2002-11-10 20:52 ` Andrew Morton [this message]
2002-11-10 21:05 ` Rik van Riel
2002-11-11 1:54 ` Andrea Arcangeli
2002-11-11 4:03 ` Andrew Morton
2002-11-11 4:06 ` Andrea Arcangeli
2002-11-11 4:22 ` Andrew Morton
2002-11-11 4:39 ` Andrea Arcangeli
2002-11-11 5:10 ` Andrew Morton
2002-11-11 5:23 ` Andrea Arcangeli
2002-11-11 7:58 ` William Lee Irwin III
2002-11-11 13:56 ` Rik van Riel
2002-11-11 13:45 ` Rik van Riel
2002-11-11 14:09 ` Jens Axboe
2002-11-11 15:48 ` Andrea Arcangeli
2002-11-11 15:43 ` Andrea Arcangeli
2002-11-10 20:56 ` Andrew Morton
2002-11-11 1:08 ` Andrea Arcangeli
-- strict thread matches above, loose matches on Subject: below --
2002-11-09 3:44 Dieter Nützel
2002-11-09 3:54 ` Con Kolivas
2002-11-09 4:02 ` Dieter Nützel
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