[dm-devel] [patch] leastpending_io load balancing policy

[Balasubramanian, Vijayakumar (STSD)]

Hi,
Attached is modified patch with the comments incorporated.

Thanks,
Vijay


> -----Original Message-----
> From: Kiyoshi Ueda [mailto:k-ueda at ct.jp.nec.com]
> Sent: Thursday, December 11, 2008 7:13 AM
> To: Balasubramanian, Vijayakumar (STSD); Alasdair G Kergon
> Cc: device-mapper development
> Subject: Re: [dm-devel] [patch] leastpending_io load balancing policy
>
> 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
>
>
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