linux-kernel - Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors

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Message-ID: <20140122093435.GS4963@suse.de>
Date:	Wed, 22 Jan 2014 09:34:36 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Ric Wheeler <rwheeler@...hat.com>
Cc:	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	lsf-pc@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going
 beyond 4096 bytes

On Tue, Jan 21, 2014 at 10:04:29PM -0500, Ric Wheeler wrote:
> One topic that has been lurking forever at the edges is the current
> 4k limitation for file system block sizes. Some devices in
> production today and others coming soon have larger sectors and it
> would be interesting to see if it is time to poke at this topic
> again.
> 

Large block support was proposed years ago by Christoph Lameter
(http://lwn.net/Articles/232757/). I think I was just getting started
in the community at the time so I do not recall any of the details. I do
believe it motivated an alternative by Nick Piggin called fsblock though
(http://lwn.net/Articles/321390/). At the very least it would be nice to
know why neither were never merged for those of us that were not around
at the time and who may not have the chance to dive through mailing list
archives between now and March.

FWIW, I would expect that a show-stopper for any proposal is requiring
high-order allocations to succeed for the system to behave correctly.

-- 
Mel Gorman
SUSE Labs
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