Re: [PATCH v6 0/6] Disable fair tag sharing for UFS devices

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On Thu, Nov 30, 2023 at 11:31:27AM -0800, Bart Van Assche wrote:
> Hi Jens,
> 
> The fair tag sharing algorithm reduces performance for UFS devices
> significantly. This is because UFS devices have multiple logical units, a
> limited queue depth (32 for UFS 3.1 devices), because it happens often that
> multiple logical units are accessed and also because it takes time to
> give tags back after activity on a request queue has stopped. This patch series
> restores UFS device performance to that of the legacy block layer by disabling
> fair tag sharing for UFS devices.

I feel like a broken record:

fair tag sharing exists for a reason.  Opting out of it for a specific
driver does not make any sense.  Either you can make a good argument
why you don't want it at all, or for specific configurations you
can clearly explain, or you make it work faster.  A "treat my driver
special" flag is never acceptable.




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