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.
