[dm-devel] [LSF/MM ATTEND] discuss blk-mq related to DM-multipath and status of XCOPY

[Nicholas A. Bellinger]

On Sun, 2015-01-04 at 12:16 -0500, Mike Snitzer wrote:
> Hi,
> 
> I'd like to attend LSF (and the first day of Vault).
> 
> As a DM maintainer I'm open to discussing anything DM related.  In
> particular I'd like to at least have hallway track discussions with
> key people interested in DM multipath support for blk-mq devices.
> Keith Busch and I have gone ahead and implemented the bulk of this
> request-based DM support for blk-mq devices, see:
> https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/log/?h=dm-for-3.20-blk-mq
> 
> But Bart says he is seeing inconsistent performance now that the code
> appears relatively stable.  I'll continue analyzing this aspect of
> things and by the time LSF rolls around I hope the code to be sorted.
> 
> Another topic we need to come to terms with is the state of XCOPY
> (whether the initial approach needs further work, etc) -- Mikulas
> Patocka reworked aspects of Martin's initial approach but it hasn't
> progressed upstream:
> https://www.redhat.com/archives/dm-devel/2014-October/msg00167.html

A big +1 on the host side XCOPY support bit.

--nab