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From: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
To: "Balasubramanian, Vijayakumar (STSD)" <vijayakumar@hp.com>,
	Alasdair G Kergon <agk@redhat.com>
Cc: device-mapper development <dm-devel@redhat.com>
Subject: Re: [patch] leastpending_io load balancing policy
Date: Thu, 11 Dec 2008 10:43:21 +0900	[thread overview]
Message-ID: <49407039.3070708@ct.jp.nec.com> (raw)
In-Reply-To: <20081203230140.GE5098@agk.fab.redhat.com>

Hi Alasdair, Vijayakumar,

Alasdair G Kergon wrote:
> Also look at request based multipath patch rqdm-dlb-02-queue-length-dlb.patch
> which addresses some but not all of those points.

FYI.
The rqdm-dlb-* patches don't depend on request-based dm-multipath,
so those can work on bio-based dm-multipath, too, with some cosmetic
changes.

Alasdair,
If you want to apply dynamic load balancer patches before request-based
dm-multipath patches, I can rebase my load balancer patches.

The reason why I've been posting those patches on top of request-based
patches is that load balancer doesn't work well in bio-based dm-multipath.
Bio-based dm-multipath is on top of the I/O scheduler, so I/O merging and
I/O sorting may occur after path switching.

Thanks,
Kiyoshi Ueda

  reply	other threads:[~2008-12-11  1:43 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-12 14:17 [patch] leastpending_io load balancing policy Balasubramanian, Vijayakumar (STSD)
2008-11-13 17:53 ` [patch] multipath-tools weighted path priority routine Balasubramanian, Vijayakumar (STSD)
2008-11-21  7:51   ` Kiyoshi Ueda
2008-12-03 22:08 ` [patch] leastpending_io load balancing policy Alasdair G Kergon
2008-12-03 23:01   ` Alasdair G Kergon
2008-12-11  1:43     ` Kiyoshi Ueda [this message]
2008-12-11 10:14       ` Balasubramanian, Vijayakumar (STSD)
2008-12-12  2:51         ` Kiyoshi Ueda
2008-12-04 11:42   ` Balasubramanian, Vijayakumar (STSD)

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