linux-ext4 - Re: Ext4 slow on links

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Message-ID: <20120621065534.GA27665@gamma.logic.tuwien.ac.at>
Date:	Thu, 21 Jun 2012 15:55:34 +0900
From:	Norbert Preining <preining@...ic.at>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Eric Sandeen <sandeen@...hat.com>, Ted Ts'o <tytso@....edu>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Ext4 slow on links

On Mi, 20 Jun 2012, Andreas Dilger wrote:
> That's what the LD_PRELOAD library that Eric referenced does - you can
> load it for any application, and it will sort the dirents in inode order.

Yes, hmm, I tried it without success. 
I did:
	export LD_PRELOAD=/path/to/spd_readdir.so
	strace -o ... /usr/bin/texlua /usr/bin/mtxrun --generate
(the bad command) and I still see stats and getdents out of
inode order.

> It would definitely be better to do this in glibc, though we've also
> been discussing on occasion doing this inside ext4 for small directories.

I have now found the thread 
	 Large directories and poor order correlation  
from March 2011 on ext4-devel, interesting read. 

Anyway, as far as I can see I cannot do much but
	fsck -D
the filesystem and see if it gets better, right?

Best wishes

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