linux-kernel - Re: Very high IOWait during all disk activity

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Message-ID: <74d8fc520803011141q74ec01e4j2185fad3f0073a16@mail.gmail.com>
Date:	Sat, 1 Mar 2008 19:41:51 +0000
From:	"Gordon Mckeown" <ml_lkml@...fluffyone.net>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	"Tomasz Chmielewski" <mangoo@...g.org>
Subject: Re: Very high IOWait during all disk activity

On Sat, Mar 1, 2008 at 1:31 PM, I wrote:
>  I'll run some more tests with different filesystems to see if this is
>  related to the use of EXT3 specifically.

Much of the system CPU usage does appear to be due to the use of EXT3;
the load with EXT2 is around half that with EXT3.

See graph of results: http://www.ubergeek.org.uk/cpu_usage.png

For Windows, the graph shows total CPU usage as reported by the OS.
For Linux, the combined User+System figure was used.

Regards,

Gordon.
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