linux-ext4 - Re: Ext4 slow on links

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Message-ID: <20120621045004.GD18182@gamma.logic.tuwien.ac.at>
Date:	Thu, 21 Jun 2012 13:50:04 +0900
From:	Norbert Preining <preining@...ic.at>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Ted Ts'o <tytso@....edu>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Ext4 slow on links

Hi Eric,

wow, thanks again.

On Mi, 20 Jun 2012, Eric Sandeen wrote:
> Hm.  Upstream coreutils fixed this for rm and some other ops:

Ok, I see.

> sorted took 2.6s, unsorted took 52s.

Got the idea, and tried it now myself not with ls etc, but
with the program that generates the caos, and yes, stracing it
gives the same result, getdents and the followed stats are all
*not* in inode order.

So that means, it should be fixed in glibc? Right? Ouuchhh...

That means that this behaviour is for *each* program using getdent
etc ...

Do you have any suggestions? Is there a way to force readdir (I guess
most people use readdir instead of getdents directly) to iterate
in inode order?

Best wishes

Norbert
------------------------------------------------------------------------
Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
JAIST, Japan                                 TeX Live & Debian Developer
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