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  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]
Date:	Mon, 2 Jul 2012 11:03:11 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Ric Wheeler <rwheeler@...hat.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Theodore Ts'o <tytso@....edu>, Fredrick <fjohnber@...o.com>,
	linux-ext4@...r.kernel.org, wenqing.lz@...bao.com
Subject: Re: ext4_fallocate

On Fri, Jun 29, 2012 at 01:02:35PM -0600, Andreas Dilger wrote:
> There is already code for this in the ext4 uninit extent handling.
> Currently the limit is 15(?) blocks, to inflate the write size up
> to zero-fill a 64kB chunk on 4kB blocksize filesystems.  I wouldn't
> object to increasing this to zero out a full 1MB (aligned) chunk
> under random IO cases.

I agree with you that we can increase it to 1MB chunk, and I will run
some tests to see the result.  In addition, I am thinking whether we can
provide a parameter in sysfs or some other places to adjust this value
dynamically.

Regards,
Zheng
--
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