linux-kernel - Re: [Regression] Filesystem I/O is CPU-bound in rc7 and rc8

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Message-ID: <21d7e9971002191302s76111f6fyd986c51b66e214ae@mail.gmail.com>
Date:	Sat, 20 Feb 2010 07:02:23 +1000
From:	Dave Airlie <airlied@...il.com>
To:	James Cloos <cloos@...loos.com>
Cc:	linux-kernel@...r.kernel.org, Chris Mason <chris.mason@...cle.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-btrfs@...r.kernel.org, jfs-discussion@...ts.sourceforge.net
Subject: Re: [Regression] Filesystem I/O is CPU-bound in rc7 and rc8

On Thu, Feb 18, 2010 at 6:04 AM, James Cloos <cloos@...loos.com> wrote:
> While getting re-aquainted with perf, and after upgrading to the current
> version, I see that do_page_fault, unmap_vmas, get_page_from_freelist,
> handle_mm_fault, __do_fault and T.1339 tend to get the most time when the
> kernel is spinning.

dmesg? lspci -vv?

We have an AGP related issue with WC/UC paging that might be related,
but I'd need more info.

Dave.
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