Re: [PATCH RFC v1 0/5] Add SCSI per device tagsets
From: John Garry
Date: Mon Feb 21 2022 - 12:42:15 EST
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