On 25.03.21 16:31, Andriy Gapon wrote:
[...]
There are some tools in tools/sched/ directory.
schedgraph.py can be used for visual inspection of scheduling traces collected
using KTR. The file has instructions on how to collect them.
Alternatively, schedgraph.d can be used to collect such traces.
If anyone affected can gather a short sample that captures the problem, then
there might be someone who would be willing to look at them.
what should I tell? I've set "kern.sched.steal_thresh: 0 -> 2" and reliably got
that
micro-suttering back while watching YouTube videos (tearing test i.e.).
Then I loaded kernel modules "dtrace.ko" and "dtraceall.ko" and ran
./schedgraph.d > /tmp/sched.out
The micro-stuttering immediately went away while above DTrace-script was
running.
So it seems that the light load of the running DTrace-script was enough to
eliminate
any micro-stutterings.
I've uploaded resulting .ktr- and .out-files (for both steal_thresh=2/0) here:
kern.sched.steal_thresh=2
-------------------------
http://156.67.189.93:9080/sched.steal2.txz
kern.sched.steal_thresh=0
-------------------------
http://156.67.189.93:9080/sched.steal0.txz
Haven't tried your mentioned first KTR-variant yet...
Thanks and BR,
Nils
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