Re: [PATCH v6 1/4] block: Make fair tag sharing configurable

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On Sun, Jan 14, 2024 at 11:22:01AM +0800, Yu Kuai wrote:
> As you might noticed, Bart and I both met the performance problem in
> production due to fair tag sharing in the environment that total driver
> tags is not sufficient. Disable fair tag sharing is a straight way to
> fix the problem, of course this is not the ideal solution, but make tag
> sharing configurable and let drivers make the decision if they want to
> disable it really solve the dilemma, and won't have any influence
> outside the driver.

How can the driver make any sensible decision here?  This really looks
like a horrible band aid.  You'll need to figure out a way to make
the fair sharing less costly or adaptic.  That might involve making it
a little less fair, which is probably ok as long a the original goals
are met.





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