From: Mike Snitzer <snitzer@redhat.com>
To: christophe.varoqui@opensvc.com,
device-mapper development <dm-devel@redhat.com>
Subject: Re: multipath: change the DEFAULT_MINIO for the request based multipath
Date: Fri, 21 Jan 2011 09:12:05 -0500 [thread overview]
Message-ID: <20110121141204.GE30411@redhat.com> (raw)
In-Reply-To: <1295599627.23625.16.camel@zezette>
On Fri, Jan 21 2011 at 3:47am -0500,
Christophe Varoqui <christophe.varoqui@gmail.com> wrote:
>
> >
> > Fortunately, the target version of multipath was also bumped
> > in 2.6.31, from 1.0.5 to 1.1.0 by this commit:
> >
> > af4874e v2.6.31-rc1 dm target:s introduce iterate devices fn
> >
> Fortunate indeed.
>
> Should the 'minio' be a tunable in the request-based multipath context,
> or should we hardcode its value to '1' ?
As my earlier response indicated: I'm not convinced _always_ using 1 for
request-based is appropriate/best.
> If we keep it a tunable, I guess we'll have to introduce a different
> 'minio' configuration parameter ('rr_min_io_rq' for example) to permit
> vendors to set their defaults for distributions shipping a rq-capable
> kernel or not. This change would be pretty invasive.
I'm not following why we'd need a different configuration parameter.
It is just that the default rr_min_io that would be used would be
conditional on the multipath target version being >= 1.1.0.
Mike
next prev parent reply other threads:[~2011-01-21 14:12 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-19 21:30 [PATCH] [RFC] multipath: change the DEFAULT_MINIO for the request based multipath Malahal Naineni
2011-01-20 7:32 ` Hannes Reinecke
2011-01-20 16:07 ` Mike Snitzer
2011-01-21 7:03 ` Jun'ichi Nomura
2011-01-21 8:47 ` Christophe Varoqui
2011-01-21 14:12 ` Mike Snitzer [this message]
2011-01-21 14:46 ` Christophe Varoqui
2011-01-21 17:39 ` Malahal Naineni
2011-01-25 8:56 ` Jun'ichi Nomura
2011-01-26 2:23 ` Malahal Naineni
2011-01-26 17:27 ` nishant mungse
2011-01-27 15:16 ` nishant mungse
2011-01-31 23:53 ` Christophe Varoqui
2011-02-01 2:21 ` Malahal Naineni
2011-02-01 3:13 ` Mike Snitzer
2011-02-01 8:14 ` Malahal Naineni
2011-02-01 8:13 ` Malahal Naineni
2011-02-01 9:00 ` Christophe Varoqui
2011-02-01 9:51 ` Malahal Naineni
2011-01-21 13:26 ` Mike Snitzer
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