Date: Fri, 18 Nov 2022 05:47:58 +0100 From: Hans Petter Selasky <hps@selasky.org> To: FreeBSD Current <freebsd-current@freebsd.org> Subject: ULE realtime scheduler advice needed Message-ID: <7ad10a5e-29d6-aaef-25cf-407d65f056cc@selasky.org>
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Hi, I'm doing some work with audio and have noticed some problems with the ULE scheduler. I have a program that generate audio based on key-presses. When no keys are pressed, the load is near 0%, but as soon as you start pressing keys, the load goes maybe to 80% of a CPU core. This program I run with rtprio 8 xxx. The issue I observe or hear actually, is that it takes too long until the scheduler grasps that this program needs it's own CPU core and stops time-sharing the program. When I however use cpuset -l xxx rtprio 8 yyy everything is good, and the program outputs realtime audio in-time. Or is this perhaps a CPU frequency stepping issue? Any advice on where to look? --HPS
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