linux-ext4 - Re: Ext4 slow on links

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <BA050E9A-2385-4FF9-B41A-3A25F3FF066A@redhat.com>
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}
> JAIST, Japan                                 TeX Live & Debian Developer
> DSA: 0x09C5B094   fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
> ------------------------------------------------------------------------
> NACTION (n.)
> The 'n' with which cheap advertising copywriters replace the word
> 'and' (as in 'fish 'n' chips', 'mix 'n' match', 'assault 'n'
> battery'), in the mistaken belief that this is in some way chummy or
> endearing.
>            --- Douglas Adams, The Meaning of Liff
> --
> To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html