Re: [PATCH RFC v1 0/5] Add SCSI per device tagsets

[John Garry]

On 18/02/2022 18:41, Melanie Plageman (Microsoft) wrote:
> For example: a device provisioned with high IOPS and BW limits on the same
> controller as a smaller and slower device can starve the slower device of tags.
> This is especially noticeable when the slower device's workload has low I/O
> depth tasks.

If you check hctx_may_queue() in the block code then it is noticeable 
that a fair allocation of HW queue depth is allocated per request queue 
to ensure we don't get starvation.

Thanks,
John