Re: [PATCH v2] block: Improve shared tag set performance

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On 1/3/23 11:53, Bart Van Assche wrote:
Remove the code for fair tag sharing because it significantly hurts
performance for UFS devices. Removing this code is safe because the
legacy block layer worked fine without any equivalent fairness
algorithm.

This algorithm hurts performance for UFS devices because UFS devices
have multiple logical units. One of these logical units (WLUN) is used
to submit control commands, e.g. START STOP UNIT. If any request is
submitted to the WLUN, the queue depth is reduced from 31 to 15 or
lower for data LUNs.

Can anyone please help with reviewing this patch?

Thanks,

Bart.




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