[dm-devel] [PATCH 02/11] block: kill QUEUE_ORDERED_BY_TAG

[Vladislav Bolkhovitin]

Hello Tejun,

Tejun Heo, on 08/12/2010 04:41 PM wrote:
> Nobody is making meaningful use of ORDERED_BY_TAG now and queue
> draining for barrier requests will be removed soon which will render
> the advantage of tag ordering moot.

Have you seen Hannes Reinecke's and my measurements in 
http://marc.info/?l=linux-scsi&m=128110662528485&w=2 and 
http://marc.info/?l=linux-scsi&m=128111995217405&w=2 correspondingly?

If yes, what else evidences do you need to see that the tag ordering is 
a big performance win?

Vlad