[Bug 260898] audible skips and video jitter during video playback
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Date: Tue, 10 Sep 2024 15:39:38 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260898
Mark Johnston <markj@FreeBSD.org> changed:
What |Removed |Added
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CC| |markj@FreeBSD.org
--- Comment #20 from Mark Johnston <markj@FreeBSD.org> ---
A while back I investigated and fixed a number of scheduler bugs which could
cause CPUs to go idle with non-empty runqueues. This manifested as
hard-to-reproduce latency spikes in various workloads. I have no proof, nor a
good way to prove it, but it might be that those patches fixed your problems as
well. ryzen/threadripper CPUs were especially susceptible to these races for
some reason.
The main fixes were:
https://cgit.freebsd.org/src/commit/?id=6d3f74a14a83b867c273c6be2599da182a9b9ec7
https://cgit.freebsd.org/src/commit/?id=03f868b163ad46d6f7cb03dc46fb83ca01fb8f69
https://cgit.freebsd.org/src/commit/?id=a889a65ba36985dfb31111ac1607be35ca2b2c8c
If you have a simple recipe for reproducing any lingering jitter problems, it
would be nice to see it, but these problems are quite hard to debug without a
reliable reproducer.
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