linux-kernel - Re: [LSF/MM TOPIC] Re: [dm-devel] Announcement: STEC EnhanceIO SSD caching software for Linux kernel

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Message-ID: <20130121130951.GA16574@redhat.com>
Date:	Mon, 21 Jan 2013 08:09:51 -0500
From:	Mike Snitzer <snitzer@...hat.com>
To:	Amit Kale <akale@...c-inc.com>
Cc:	"Darrick J. Wong" <darrick.wong@...cle.com>,
	device-mapper development <dm-devel@...hat.com>,
	"linux-bcache@...r.kernel.org" <linux-bcache@...r.kernel.org>,
	"kent.overstreet@...il.com" <kent.overstreet@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"lsf-pc@...ts.linux-foundation.org" 
	<lsf-pc@...ts.linux-foundation.org>, Joe Thornber <ejt@...hat.com>
Subject: Re: [LSF/MM TOPIC] Re: [dm-devel] Announcement: STEC EnhanceIO SSD
 caching software for Linux kernel

On Mon, Jan 21 2013 at 12:26am -0500,
Amit Kale <akale@...c-inc.com> wrote:

> > -----Original Message-----
> > From: Mike Snitzer [mailto:snitzer@...hat.com]
> > Sent: Saturday, January 19, 2013 3:08 AM
> > To: Darrick J. Wong
> > Cc: device-mapper development; Amit Kale; linux-bcache@...r.kernel.org;
> > kent.overstreet@...il.com; LKML; lsf-pc@...ts.linux-foundation.org; Joe
> > Thornber
> > Subject: Re: [LSF/MM TOPIC] Re: [dm-devel] Announcement: STEC EnhanceIO
> > SSD caching software for Linux kernel
> > 
> > On Fri, Jan 18 2013 at  4:25pm -0500,
> > Darrick J. Wong <darrick.wong@...cle.com> wrote:
> > 
> > > Since Joe is putting together a testing tree to compare the three
> > > caching things, what do you all think of having a(nother) session
> > > about ssd caching at this year's LSFMM Summit?
> > >
> > > [Apologies for hijacking the thread.]
> > > [Adding lsf-pc to the cc list.]
> > 
> > Hopefully we'll have some findings on the comparisons well before LSF
> > (since we currently have some momentum).  But yes it may be worthwhile
> > to discuss things further and/or report findings.
> 
> We should have performance comparisons presented well before the
> summit. It'll be good to have ssd caching session in any case. The
> likelihood that one of them will be included in Linux kernel before
> April is very low.

dm-cache is under active review for upstream inclusion.  I wouldn't
categorize the chances of dm-cache going upstream when the v3.9 merge
window opens as "very low".  But even if dm-cache does go upstream it
doesn't preclude bcache and/or enhanceio from going upstream too.
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