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Re: Questions for article

To: Eric Sandeen <sandeen@xxxxxxxxxxx>
Subject: Re: Questions for article
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 4 Jun 2008 01:28:59 -0400
Cc: Thomas King <kingttx@xxxxxxxxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <4845C254.6050104@xxxxxxxxxxx>
References: <13033.143.166.226.57.1212526129.squirrel@xxxxxxxxxxxxxxxxxxxxxxx> <4845C254.6050104@xxxxxxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx
User-agent: Mutt/1.5.17 (2007-11-01)
On Tue, Jun 03, 2008 at 05:14:44PM -0500, Eric Sandeen wrote:
> It's also not clear to me that this is really a critical feature for
> large filesystems; space allocation is not done block by block per se in
> xfs, as Mr. Newman seems (?) to imply (?)  The block granularity is
> there throughout the fs but I'm not sure how much it matters in
> practice.  Dave...?

For streaming I/O workloads it doesn't matter anymore, see Dave's 2006
OLS talk.  The direct to bio I/O path mitigates any blocksize impact.


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