linux-ext4 - Re: Ext4 slow on links

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Message-ID: <20120620040152.GB2395@gamma.logic.tuwien.ac.at>
Date:	Wed, 20 Jun 2012 13:01:52 +0900
From:	Norbert Preining <preining@...ic.at>
To:	Eric Sandeen <esandeen@...hat.com>
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

Hi Eric,

On Di, 19 Jun 2012, Eric Sandeen wrote:
> You might see if the dir itself is badly fragmented

I don't think so, since I did:
	for i in /usr/local/font-collection/......./* ; do ln -s $i . ; done

	reboot

	time ls -l >/dev/null

newly created entries shouldn't b fragmented, I guess.

> (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.

I will investigate, but it is the first time I look into that so
if you have a link to quick howto, great, otherwise I read through
man pages ;-)

Best wishes

Norbert
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