* Seemingly random performance degradation in 4.13
@ 2017-09-13 4:29 vcaputo
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From: vcaputo @ 2017-09-13 4:29 UTC (permalink / raw)
To: linux-kernel
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
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