From: Alasdair G Kergon <agk@redhat.com>
To: Hannes Reinecke <hare@suse.de>
Cc: linux-block@vger.kernel.org,
Junichi Nomura <j-nomura@ce.jp.nec.com>,
device-mapper development <dm-devel@redhat.com>,
lsf-pc@lists.linux-foundation.org,
Mike Snitzer <snitzer@redhat.com>
Subject: Re: [LSF/MM ATTEND] plan to deprecate old .request_fn request-based code path?
Date: Wed, 13 Jan 2016 11:02:40 +0000 [thread overview]
Message-ID: <20160113110240.GB452@agk-dp.fab.redhat.com> (raw)
In-Reply-To: <56960904.5060006@suse.de>
On Wed, Jan 13, 2016 at 09:21:24AM +0100, Hannes Reinecke wrote:
> We have been down that road already. It doesn't work.
> There is a reason why we switched to request-based multipathing.
It's worth reminding people of the original write-up explaining this
switch:
https://www.kernel.org/doc/ols/2007/ols2007v2-pages-235-244.pdf
(and that since that was written, there have been plenty of changes,
both to the request-based code itself and the bio-based path which Kent
streamlined).
Alasdair
next prev parent reply other threads:[~2016-01-13 11:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-12 18:59 [LSF/MM ATTEND] plan to deprecate old .request_fn request-based code path? Mike Snitzer
2016-01-12 23:39 ` Mikulas Patocka
2016-01-13 8:21 ` Hannes Reinecke
2016-01-13 11:02 ` Alasdair G Kergon [this message]
2016-01-15 15:28 ` Benjamin Marzinski
2016-01-15 16:19 ` Mike Snitzer
2016-01-13 11:16 ` Sagi Grimberg
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