linux-kernel - Re: Linux 2.6.29

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 for Android: free password hash cracker in your pocket

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

Message-ID: <72dbd3150904020929w46c6dc0bs4028c49dd8fa8c56@mail.gmail.com>
Date:	Thu, 2 Apr 2009 09:29:59 -0700
From:	David Rees <drees76@...il.com>
To:	Janne Grunau <j@...nau.net>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Thu, Apr 2, 2009 at 4:05 AM, Janne Grunau <j@...nau.net> wrote:
>> Current kernels just have too much IO latency
>> with ext3 it seems.
>
> MythTV calls fsync every few seconds on ongoing recordings to prevent
> stalls due to large cache writebacks on ext3.

Personally that is also one of my MythTV pet peeves.  A hack added to
MythTV to work around a crappy ext3 latency bug that also causes these
large files to get heavily fragmented.  That and the fact that yo have
to patch MythTV to eliminate those forced fdatasyncs - there is no
knob to turn it off if you're running MythTV on a filesystem which
doesn't suffer from ext3's data=ordered fsync stalls.

-Dave
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/