From: Giuliano Pochini <pochini@shiny.it>
To: linux-kernel@vger.kernel.org
Cc: "chen, xiangping" <chen_xiangping@emc.com>,
Andrew Morton <akpm@zip.com.au>
Subject: Re: Poor read performance when sequential write presents
Date: Fri, 24 May 2002 10:59:42 +0200 (CEST) [thread overview]
Message-ID: <XFMail.20020524105942.pochini@shiny.it> (raw)
In-Reply-To: <3CED4843.2783B568@zip.com.au>
>> I did a IO test with one sequential read and one sequential write
>> to different files. I expected somewhat similar throughput on read
>> and write. But it seemed that the read is blocked until the write
>> finishes. After the write process finished, the read process slowly
>> picks up the speed. Is Linux buffer cache in favor of write? How
>> to tune it?
> [...]
> 2: Apply http://www.zip.com.au/~akpm/linux/patches/2.4/2.4.19-pre5/read-latency2.patch
Hmmm, someone wrote a patch to fix another related problem: the fact
that multiple readers read at a very different speed. It's not unusual
that one reader gets stuck until all other have finished. I don't
remember who wrote that patch, sorry.
Bye.
next prev parent reply other threads:[~2002-05-24 9:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-23 14:20 chen, xiangping
2002-05-23 19:51 ` Andrew Morton
2002-05-24 8:59 ` Giuliano Pochini [this message]
2002-05-24 9:26 ` Andrew Morton
2002-05-24 9:46 ` William Lee Irwin III
2002-05-24 10:04 ` Andrew Morton
2002-05-27 8:06 ` Jens Axboe
2002-05-27 8:22 ` Andrew Morton
2002-05-27 8:54 ` Jens Axboe
2002-05-27 9:35 ` Andrew Morton
2002-05-28 9:25 ` Jens Axboe
2002-05-28 9:36 ` Jens Axboe
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