linux-ext4 - Re: Ext4 performance regression: Post 2.6.30

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Message-ID: <87f94c371003290810u58f64ce6uc20be6bbac420e73@mail.gmail.com>
Date:	Mon, 29 Mar 2010 11:10:55 -0400
From:	Greg Freemyer <greg.freemyer@...il.com>
To:	Keith Mannthey <kmannth@...ibm.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: Ext4 performance regression: Post 2.6.30

On Mon, Mar 29, 2010 at 2:25 AM, Keith Mannthey <kmannth@...ibm.com> wrote:
>
>
> After 2.6.30 I am seeing large performance regressions on a raid setup.
> I am working to publish a larger amount of data but I wanted to get some
> quick data out about what I am seeing.
>

Is mdraid involved?

They added barrier support for some configs after 2.6.30 I believe.
It can cause a drastic perf change, but it increases reliability and
is "correct".

Greg
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