From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Mark Watts <m.watts@eris.qinetiq.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: High CPU usage (up to server hang) under heavy I/O load
Date: Mon, 16 Aug 2004 11:57:26 +0100 [thread overview]
Message-ID: <1092653845.20528.3.camel@localhost.localdomain> (raw)
In-Reply-To: <200408161013.13829.m.watts@eris.qinetiq.com>
On Llu, 2004-08-16 at 10:13, Mark Watts wrote:
> Would this also mean that if I stick a 64bit SATA raid card (a 3Ware 8506-4LP
> in this case) into a 32bit pci slot, then I/O is always going to suck badly?
>
> ... cos I do, and I/O sucks :)
Seperate issue.
64bit DMA is 64bit addressing (ie can DMA from above 4GB). 64bit wide
slot is double the speed for transfers. The 3ware 8xxx I thought could
do 64bit addressing although the driver seems to indicate it cannot,
so with over 4Gb it would hurt.
next prev parent reply other threads:[~2004-08-16 11:59 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-13 14:01 High CPU usage (up to server hang) under heavy I/O load Sylvain COUTANT
2004-08-13 15:36 ` Matt Domsch
2004-08-13 15:46 ` Sylvain COUTANT
2004-08-14 3:39 ` Tom Sightler
2004-08-15 9:11 ` Lenar Lõhmus
2004-08-15 20:30 ` Sylvain COUTANT
2004-08-16 12:43 ` Matt Domsch
2004-08-13 16:20 ` Marcelo Tosatti
2004-08-13 17:53 ` Sylvain COUTANT
2004-08-16 10:11 ` Sylvain COUTANT
2004-08-16 11:49 ` Sylvain COUTANT
2004-08-13 22:16 ` Alan Cox
2004-08-16 9:13 ` Mark Watts
2004-08-16 10:57 ` Alan Cox [this message]
2004-08-16 12:10 ` Mark Watts
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