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

-----Original Message-----
From: Mike Snitzer [mailto:snitzer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org]
Sent: Monday, January 21, 2013 6:40 PM
To: Amit Kale
Cc: Darrick J. Wong; device-mapper development; linux-
bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; kent.overstreet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org; LKML; lsf-
pc-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org; Joe Thornber
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 [off-list ref] wrote:

quoted

quoted

-----Original Message-----
From: Mike Snitzer [mailto:snitzer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org]
Sent: Saturday, January 19, 2013 3:08 AM
To: Darrick J. Wong
Cc: device-mapper development; Amit Kale;
linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; kent.overstreet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org; LKML;
lsf-pc-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.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
[off-list ref] wrote:

quoted

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.

I agree. We haven't seen a full comparison yet, IMHO. If different solutions offer mutually exclusive benefits, it'll be worthwhile including them all.

We haven't submitted EnhanceIO for an inclusion yet. Need more testing from the community before we can mark it Beta.
-Amit

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