Johan Borkhuis wrote: > Jan Kiszka wrote: >> I don't see anything suspicious right now, so please consider capturing >> a trace with the latency as I suggested. That should give a full picture >> of what is happening when latency detects that huge delay. >> >> Jan > To get the tracing to work I had to set CONFIG_IPIPE_TRACE_VMALLOC, as > my system did not boot when this was not set. I also set
Yep, that's "normal" on small system (and might be better documented somewhere, suggestions welcome). > CONFIG_IPIPE_TRACE_SHIFT to 16. I attached the logfile of a latency > session. You are now seeing a latency of 1800 us, but you trace only lasts back a few ten us. Please extend it (back_trace_points) to cover the full range. We see some ugly priority inversion, we now need to find the point where this started. Jan PS: I personally might not be able to answer following posts until Wednesday, just to inform you.
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