From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Mason <chris.mason@oracle.com>
Subject: Re: [PATCH 4/4] add snapshot/subvolume destroy ioctl
Date: Thu, 24 Sep 2009 09:59:55 -0400
Message-ID: <20090924135955.GC2797@think>
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 <4486336c0909240127v2a3320c7s52db89b12d1d7272@mail.gmail.com>
 <20090924124322.GB2797@think>
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To: john <yyalone@gmail.com>, "Yan, Zheng" <zheng.yan@oracle.com>,
	linux-btrfs@vger.kernel.org
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On Thu, Sep 24, 2009 at 08:43:22AM -0400, Chris Mason wrote:
> On Thu, Sep 24, 2009 at 04:27:57PM +0800, john wrote:
> >    After a git bisect, I think this patch may introduce a performance
> >    regression(about 15% slower) in postmark benchmark. Sometimes(last a few
> >    seconds) in the test, CPU usage is 100% wait but NO IO is performing, it's
> >    not IO-wait. This didn't happen for earlier versions.
> >    test*environment:
> >    hard disk: INTEL X25-E SSD 64G
> >    mkfs options: mkfs.btrfs -m single /dev/xxx
> >    mount options: -o ssd,nodatasum,nodatacow
> 
> Thanks, I'll give this a shot here.

Looks like Yan Zheng already tracked it down.  I've pushed his fix out
to the master branch.

Thanks,
Chris