linux-ext4 - Re: [PATCH v2] ext4: dynamical adjust the length of zero-out chunk

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Message-ID: <20120813194902.GG9117@lenny.home.zabbo.net>
Date:	Mon, 13 Aug 2012 12:49:02 -0700
From:	Zach Brown <zab@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Andreas Dilger <adilger@...ger.ca>,
	Zheng Liu <wenqing.lz@...bao.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Zheng Liu <gnehzuil.liu@...il.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2] ext4: dynamical adjust the length of zero-out chunk

> The previously rule of thumb which I had used was that after doing a
> random seek, the time needed to write 4k and 32k was pretty much in
> the noise.  But that was a number from several years ago.  I suppose I
> should do some quick experiments to see what is a good number these
> days....

Indeed.  fio to the rescue.

I remember Christoph saying something about 64k somewhat recently?  But,
helpfully, I can't recall the details :).

- z
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