From: Vladislav Bolkhovitin <vst@vlnb.net>
To: Bryan Henderson <hbryan@us.ibm.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
iscsitarget-devel@lists.sourceforge.net,
linux-scsi@vger.kernel.org
Subject: Re: [ANNOUNCE] iSCSI enterprise target software
Date: Wed, 02 Mar 2005 13:47:26 +0300 [thread overview]
Message-ID: <422599BE.9020008@vlnb.net> (raw)
In-Reply-To: <OF551AE89E.73361D54-ON88256FB7.00720071-88256FB7.0072B239@us.ibm.com>
Bryan Henderson wrote:
>>You want to *use* the kernel pagecache as much as you can.
>
>
> No, I really don't. Not always. I can think of only 2 reasons to
> maximize my use of the kernel pagecache: 1) saves me duplicating code; 2)
> allows me to share resources (memory and disk bandwidth come to mind) with
> others in the same Linux system fairly. There are many cases where those
> two benefits are outweighed by the benefits of using some other cache. If
> you're thinking of other benefits of using the pagecache, let's hear them.
You forgot the third reason (benefit), though it doesn't directly
related to the page cache: read ahead. It greatly influences on the
performance and a direct I/O application has to reimplement this logic,
which generally isn't straightforward task.
Vlad
next prev parent reply other threads:[~2005-03-02 10:44 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-01 7:19 [ANNOUNCE] iSCSI enterprise target software FUJITA Tomonori
2005-03-01 8:40 ` Arjan van de Ven
2005-03-01 9:35 ` FUJITA Tomonori
2005-03-01 9:46 ` Arjan van de Ven
2005-03-01 10:22 ` [Iscsitarget-devel] " FUJITA Tomonori
2005-03-01 10:33 ` Arjan van de Ven
2005-03-01 10:46 ` Arjan van de Ven
2005-03-01 11:23 ` FUJITA Tomonori
2005-03-01 10:48 ` Libor Vanek
2005-03-01 10:51 ` Arjan van de Ven
2005-03-01 18:24 ` Bryan Henderson
2005-03-01 18:37 ` Arjan van de Ven
2005-03-01 18:48 ` Ming Zhang
2005-03-01 19:01 ` Jeff Garzik
2005-03-01 19:14 ` Ming Zhang
2005-03-01 21:04 ` Bryan Henderson
2005-03-01 21:15 ` Ming Zhang
2005-03-02 18:20 ` Bryan Henderson
2005-03-02 19:34 ` Ming Zhang
2005-03-01 21:16 ` Arjan van de Ven
2005-03-02 18:27 ` Bryan Henderson
2005-03-02 3:30 ` FUJITA Tomonori
2005-03-01 20:38 ` Andi Kleen
2005-03-01 20:49 ` Ming Zhang
2005-03-01 22:19 ` Christoph Hellwig
2005-03-01 20:53 ` Bryan Henderson
2005-03-01 20:58 ` Arjan van de Ven
2005-03-02 10:47 ` Vladislav Bolkhovitin [this message]
2005-03-02 18:39 ` Bryan Henderson
2005-03-02 5:04 ` [Iscsitarget-devel] " FUJITA Tomonori
2005-03-02 5:21 ` Dmitry Yusupov
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