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

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Date:	Wed, 22 Jan 2014 20:13:20 +0000
From:	Chris Mason <clm@...com>
To:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"lsf-pc@...ts.linux-foundation.org" 
	<lsf-pc@...ts.linux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"rwheeler@...hat.com" <rwheeler@...hat.com>,
	"James.Bottomley@...senpartnership.com" 
	<James.Bottomley@...senpartnership.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"mgorman@...e.de" <mgorman@...e.de>
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going
 beyond 4096 bytes

On Wed, 2014-01-22 at 11:50 -0800, Andrew Morton wrote:
> On Wed, 22 Jan 2014 11:30:19 -0800 James Bottomley <James.Bottomley@...senpartnership.com> wrote:
> 
> > But this, I think, is the fundamental point for debate.  If we can pull
> > alignment and other tricks to solve 99% of the problem is there a need
> > for radical VM surgery?  Is there anything coming down the pipe in the
> > future that may move the devices ahead of the tricks?
> 
> I expect it would be relatively simple to get large blocksizes working
> on powerpc with 64k PAGE_SIZE.  So before diving in and doing huge
> amounts of work, perhaps someone can do a proof-of-concept on powerpc
> (or ia64) with 64k blocksize.


Maybe 5 drives in raid5 on MD, with 4K coming from each drive.  Well
aligned 16K IO will work, everything else will about the same as a rmw
from a single drive.

-chris

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