linux-ext4 - Re: Ext4 slow on links

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Message-ID: <4FE14034.6070800@redhat.com>
Date:	Tue, 19 Jun 2012 22:15:00 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Norbert Preining <preining@...ic.at>
CC:	linux-ext4@...r.kernel.org
Subject: Re: Ext4 slow on links

On 6/19/12 7:20 PM, Norbert Preining wrote:
> Dear all
> 
> (please Cc)
> 
> I recently had to track down a big delay in one of my Debian packages,
> and it turned out that it seems to be due to ext4 being *horribly*
> slow on dealing with symlinks.
> 
> On my system, if I create a directory with 8000 symlinks (that is
> a real case of a font package shipping special encoded files) and
> the symlink targets are "far away" (long names), then, after 
> a reboot a simply
> 	ls -l
> in this directory took 1m20sec. While on second run it is down to 2secs
> (nice caching).

As Ted said, the targets might be far-flung.  If you do /bin/ls -l instead
of maybe an aliased ls which stats everything to make pretty colors,
is that faster?

-Eric
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