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: <b7bb17e28bad417d37765814626bb886.squirrel@webmail.greenhost.nl>
Date:	Tue, 7 Apr 2009 17:39:30 +0200 (CEST)
From:	"Indan Zupancic" <indan@....nu>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Jens Axboe" <jens.axboe@...cle.com>,
	"Theodore Tso" <tytso@....edu>,
	"Linux Kernel Developers List" <linux-kernel@...r.kernel.org>,
	"Ext4 Developers List" <linux-ext4@...r.kernel.org>
Subject: Re: [GIT PULL] Ext3 latency fixes

On Sat, April 4, 2009 17:57, Linus Torvalds wrote:
>
> On Sat, 4 Apr 2009, Jens Axboe wrote:
>>
>> Big nack on this patch. Ted, this is EXACTLY where I told you we saw big
>> write regressions (sqlite performance drops by a factor of 4-5). Do a
>> git log on fs/buffer.c and see the original patch (which does what your
>> patch does) and the later revert. No idea why you are now suggestion
>> making that exact change?!
>
> Jens, if I can re-create the 'fsync' times (I haven't yet), then the
> default scheduler _will_ be switched to AS.

http://bugzilla.kernel.org/show_bug.cgi?id=5900

I can try it with a different fs, kernel or machine as well.

To me it seems this stuff is way more tricky than it should be, with
all the interaction between fs, vm, io schedulers and hardware.
Perhaps there's a need for one sophisticated io scheduler that gets
enough information from the rest to make the right decisions. Sync
or not sync isn't enough info.


--
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

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ