linux-ext4 - Re: Ext4 slow on links

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Date:	Tue, 19 Jun 2012 23:57:16 -0400 (EDT)
From:	Eric Sandeen <esandeen@...hat.com>
To:	Norbert Preining <preining@...ic.at>
Cc:	"Ted Ts'o" <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Ext4 slow on links

On Jun 19, 2012, at 10:38 PM, Norbert Preining <preining@...ic.at> wrote:

> Hi Ted, hi Eric,
> 
> thanks for the answers, here some remarks.
> 
...

> On Di, 19 Jun 2012, Eric Sandeen wrote:
>> 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?
> 
> Might be the problem, but I saw the same with a program doing
> opendir readdir etc, so no allias or external program involved.
> 
Of course ls -l must stat anyway.  I shouldn't compose emails so late.  :). 

You might see if the dir itself is badly fragmented (if not filefrag, stat in debugfs would show you block mapping) and maybe a blktrace of the actions would show you something interesting as well.

Eric

> Best wishes
> 
> Norbert
> ------------------------------------------------------------------------
> Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
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