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

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Date:	Wed, 22 Jan 2014 11:50:02 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	Ric Wheeler <rwheeler@...hat.com>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Chris Mason <clm@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"mgorman@...e.de" <mgorman@...e.de>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"lsf-pc@...ts.linux-foundation.org" 
	<lsf-pc@...ts.linux-foundation.org>
Subject: Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going
 beyond 4096 bytes

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.

That way we'll at least have an understanding of what the potential
gains will be.  If the answer is "1.5%" then poof - go off and do
something else.

(And the gains on powerpc would be an upper bound - unlike powerpc, x86
still has to fiddle around with 16x as many pages and perhaps order-4
allocations(?))

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