linux-kernel - Re: btrfs: 21 minutes to read 1.2M file directory

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Message-ID: <20101222203915.GA9918@hexapodia.org>
Date:	Wed, 22 Dec 2010 12:39:15 -0800
From:	Andy Isaacson <adi@...apodia.org>
To:	Felipe Contreras <felipe.contreras@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: btrfs: 21 minutes to read 1.2M file directory

On Tue, Dec 21, 2010 at 03:07:33AM +0200, Felipe Contreras wrote:
> On Tue, Dec 21, 2010 at 12:24 AM, Andy Isaacson <adi@...apodia.org> wrote:
> > I have a directory with 1.2M files in it, which makes readdir very slow
> > on btrfs with cold caches (although it's reasonably fast with hot caches
> > as in the first example below):
> 
> Sounds like:
> 
> Bug 21562 - btrfs is dead slow due to fragmentation
> https://bugzilla.kernel.org/show_bug.cgi?id=21562

Hmmm, how do I look at the btree layout for a given inode?

btrfs-image for this filesystem is 1.7GiB .bz2, so I'm afraid it's not
reasonable to publish it.

-andy
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