Hello, I've been working on some graphics hacks which has me paying close attention to frame rates. Something I've noticed recently in the 4.13 cycle is a seemingly random loss of ~40% frame rate. These are purely software-rendered hacks, and I haven't spent much time trying to figure out what is changing when the performance drops - typically the performance is restored on a subsequent boot.
There's been talk of NUMA and scheduler related performance regressions, and I'm wondering if that's related to what I'm observing. Is there a fix floating around I can apply and see if it prevents regressions from occurring? FYI the machine in question is a 1.8Ghz core2 duo thinkpad x61s, currently on 4.13-rc7. If there's anything in particular that would be useful for me to capture when running one of these tests, a specific perf incantation for example, I'm happy to test and report the results. Cheers, Vito Caputo
