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Re: XFS performance issues: O_DIRECT and Linux 2.6.6+

To: Nathan Scott <nathans@xxxxxxx>
Subject: Re: XFS performance issues: O_DIRECT and Linux 2.6.6+
From: James Foris <james.foris@xxxxxxxxxx>
Date: Tue, 14 Sep 2004 12:04:12 -0500
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <20040914095914.A4118499@xxxxxxxxxxxxxxxxxxxxxxxx>
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Nathan Scott wrote:
Hi James,

On Mon, Sep 13, 2004 at 11:56:33AM -0500, James Foris wrote:

More correctly, it happened between 2.6.5 and 2.6.5-bk1

So..... something in the 2.6.5-bk1 patchset caused the change.
Any suggestions where to begin looking (other than fs/direct_io.x) ?


http://kernel.org/pub/linux/kernel/v2.6/snapshots/old/patch-2.6.5-bk1.log

search for "direct" -- looks like -bk1 includes all the changes I
was refering to earlier (and a bunch more) :(  So, the needle is
somewhere in that haystack...

Sorry...Forgot to mention -

The printk warnings did not appear again until I exceeded th the 150K file write size,
at which time the performance dropped dramatically.

Jim Foris


cheers.




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