linux-kernel - Re: [RFC] Heads up on sys

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Message-ID: <20070307113016.GC15583@lazybastard.org>
Date:	Wed, 7 Mar 2007 12:30:16 +0100
From:	Jörn Engel <joern@...ybastard.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Mingming Cao <cmm@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>, nscott@...nex.com,
	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, suparna@...ibm.com, alex@...sterfs.com,
	suzuki@...ibm.com
Subject: Re: [RFC] Heads up on sys_fallocate()

On Wed, 7 March 2007 09:51:35 +0100, Jan Kara wrote:
>
>   I'll probably first write some userspace fs-reorganizer to find out how
> much these changes in layout are able to give you in performance (i.e.
> whether it's worth the effort of more complicated kernel online
> defragmenter).

Have tried profiling the read accesses and prereading them
asynchronously on startup?  That appears to have improved E17 a lot.
See http://lca2007.linux.org.au/talk/101 (and watch the video).

Jörn

-- 
The competent programmer is fully aware of the strictly limited size of
his own skull; therefore he approaches the programming task in full
humility, and among other things he avoids clever tricks like the plague.
-- Edsger W. Dijkstra
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