Re: [PATCH] pipe_read: don't wake up the writer if the pipe is still full

[Linus Torvalds]

On Fri, 31 Jan 2025 at 01:50, K Prateek Nayak <kprateek.nayak@xxxxxxx> wrote:
>
> On my 3rd Generation EPYC system (2 x 64C/128T), I see that on reverting
> the changes on the above mentioned commit, sched-messaging sees a
> regression up until the 8 group case which contains 320 tasks, however
> with 16 groups (640 tasks), the revert helps with performance.

I suspect that the extra wakeups just end up perturbing timing, and
then you just randomly get better performance on that particular
test-case and machine.

I'm not sure this is worth worrying about, unless there's a real load
somewhere that shows this regression.

            Linus