From: Alasdair G Kergon <agk@redhat.com>
To: Ric Wheeler <ric@emc.com>
Cc: device-mapper development <dm-devel@redhat.com>,
Andi Kleen <andi@firstfloor.org>,
Michael Tokarev <mjt@tls.msk.ru>,
linux-kernel@vger.kernel.org
Subject: Re: Re: [PATCH] Implement barrier support for single device DM devices
Date: Tue, 19 Feb 2008 02:45:33 +0000 [thread overview]
Message-ID: <20080219024533.GC4066@agk.fab.redhat.com> (raw)
In-Reply-To: <47B98D8A.7090506@emc.com>
On Mon, Feb 18, 2008 at 08:52:10AM -0500, Ric Wheeler wrote:
> I understand that. Most of the time, dm or md devices are composed of
> uniform components which will uniformly support (or not) the cache flush
> commands used by barriers.
As a dm developer, it's "almost none of the time" because trivial
configurations aren't the ones that require lots of testing effort.
Let's stop arguing over "most of the time":-)
As Andi points out, there are certainly enough real-world users of
"single linear or crypt target using one physical device" for it to be
worth our supporting it.
Alasdair
--
agk@redhat.com
WARNING: multiple messages have this Message-ID (diff)
From: Alasdair G Kergon <agk@redhat.com>
To: Ric Wheeler <ric@emc.com>
Cc: Michael Tokarev <mjt@tls.msk.ru>,
device-mapper development <dm-devel@redhat.com>,
Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org
Subject: Re: [dm-devel] Re: [PATCH] Implement barrier support for single device DM devices
Date: Tue, 19 Feb 2008 02:45:33 +0000 [thread overview]
Message-ID: <20080219024533.GC4066@agk.fab.redhat.com> (raw)
In-Reply-To: <47B98D8A.7090506@emc.com>
On Mon, Feb 18, 2008 at 08:52:10AM -0500, Ric Wheeler wrote:
> I understand that. Most of the time, dm or md devices are composed of
> uniform components which will uniformly support (or not) the cache flush
> commands used by barriers.
As a dm developer, it's "almost none of the time" because trivial
configurations aren't the ones that require lots of testing effort.
Let's stop arguing over "most of the time":-)
As Andi points out, there are certainly enough real-world users of
"single linear or crypt target using one physical device" for it to be
worth our supporting it.
Alasdair
--
agk@redhat.com
next prev parent reply other threads:[~2008-02-19 2:45 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-15 12:08 [PATCH] Implement barrier support for single device DM devices Andi Kleen
2008-02-15 12:20 ` Alasdair G Kergon
2008-02-15 13:07 ` Michael Tokarev
2008-02-15 14:20 ` Andi Kleen
2008-02-15 14:12 ` Alasdair G Kergon
2008-02-15 14:12 ` [dm-devel] " Alasdair G Kergon
2008-02-15 15:34 ` Andi Kleen
2008-02-15 15:34 ` [dm-devel] " Andi Kleen
2008-02-15 15:31 ` Alan Cox
2008-02-15 15:31 ` [dm-devel] " Alan Cox
2008-02-18 12:48 ` Ric Wheeler
2008-02-18 12:48 ` [dm-devel] " Ric Wheeler
2008-02-18 13:24 ` Michael Tokarev
2008-02-18 13:52 ` Ric Wheeler
2008-02-18 13:52 ` [dm-devel] " Ric Wheeler
2008-02-19 2:45 ` Alasdair G Kergon [this message]
2008-02-19 2:45 ` Alasdair G Kergon
2008-05-16 19:55 ` Mike Snitzer
2008-05-16 19:55 ` [dm-devel] " Mike Snitzer
2008-05-16 21:48 ` Andi Kleen
2008-05-16 21:48 ` [dm-devel] " Andi Kleen
2008-02-18 22:16 ` David Chinner
2008-02-19 2:56 ` Alasdair G Kergon
2008-02-19 2:56 ` [dm-devel] " Alasdair G Kergon
2008-02-19 5:36 ` David Chinner
2008-02-19 5:36 ` David Chinner
2008-02-19 9:43 ` Andi Kleen
2008-02-19 9:43 ` Andi Kleen
2008-02-19 7:19 ` Jeremy Higdon
2008-02-19 7:19 ` [dm-devel] " Jeremy Higdon
2008-02-19 7:58 ` Michael Tokarev
2008-02-20 13:38 ` Ric Wheeler
2008-02-20 13:38 ` [dm-devel] " Ric Wheeler
2008-02-21 3:29 ` Neil Brown
2008-02-21 3:29 ` [dm-devel] " Neil Brown
2008-02-21 3:39 ` Neil Brown
2008-02-17 23:31 ` David Chinner
2008-02-19 2:39 ` Alasdair G Kergon
2008-02-19 2:39 ` Alasdair G Kergon
2008-02-19 11:12 ` David Chinner
-- strict thread matches above, loose matches on Subject: below --
2008-09-11 14:12 Mat
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