linux-kernel - Re: Recent kernel "mount" slow

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Message-ID: <50AF7901.20401@kernel.dk>
Date:	Fri, 23 Nov 2012 14:24:17 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Jeff Chua <jeff.chua.linux@...il.com>, Jan Kara <jack@...e.cz>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: Recent kernel "mount" slow

On 2012-11-22 20:21, Linus Torvalds wrote:
> Doesn't sound like a fsdevel issue since it seems to be independent of
> filesystems. More like some generic block layer thing. Adding Jens
> (and quoting the whole thing)
> 
> Jens, any ideas? Most of your stuff came in after -rc2, which would
> fit with the fact that most of the slowdown seems to be after -rc2
> according to Jeff.

No ideas. Looking at what went in from my side, only the rq plug sorting
is a core change, and that should not cause any change in behaviour for
a single device. That's commit 975927b9.

> Jeff, more bisecting would be good, though.

Probably required, yes...

-- 
Jens Axboe

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