linux-ext4 - Re: Filesystem benchmarks on reasonably fast hardware

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Message-ID: <CAGBYx2aSK2p9_X45p5AM=BPFOzwWDHUDxtf3Q7xrvT1dHKrquw@mail.gmail.com>
Date:	Wed, 27 Jul 2011 11:39:08 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	Jörn Engel <joern@...fs.org>,
	"Ted Ts'o" <tytso@....edu>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: Filesystem benchmarks on reasonably fast hardware

Hi  Jörn and Ted,

Could you anyone send out the ext4 lock stat on the list?

Thank you,
Yongqiang.


On Tue, Jul 26, 2011 at 10:57 PM, Ted Ts'o <tytso@....edu> wrote:
> On Mon, Jul 25, 2011 at 08:20:37PM +0200, Jörn Engel wrote:
>> On Mon, 25 July 2011 11:18:25 -0400, Ted Ts'o wrote:
>> >
>> > Did you have a chance to do an ext4 lockstat run?
>
> Hi Jörn,
>
> Thanks for forwarding it to me.  It's the same problem as in XFS, the
> excessive coverage of the i_mutex lock.  In ext4's case, it's in the
> generic generic_file_aio_write() machinery where we need to do the
> lock busting.  (XFS apparently doesn't use the generic routines, so
> the fix that Dave did won't help ext3 and ext4.)
>
> I don't have the time to look at it now, but I'll put it on my todo
> list; or maybe someone with a bit more time can look into how we might
> be able to use a similar approach in the generic file system code.
>
>                                                 - Ted
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-- 
Best Wishes
Yongqiang Yang
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