Re: 8aeb879baf12 - significant system call latency regression, bisected

[Linus Torvalds]

On Thu, 18 Jun 2026 at 19:08, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> Considering that your load should all be hot-cache anyway, maybe the
> problem was never the alignment - which, if the load really is in the
> cache, shouldn't matter that much anyway, and certainly not 90 cycles
> worth.

Ahh, your numbers said 80 cycles, not 90, I mis-remembered.

Still - same thing. 80 or 90 cycles is not a "L2 miss". That really
smells like a "front end flush" kind of number where you have started
lots of work and are throwing it all away to restart it.

                   Linus