Linux sampling rate limits.

dmesg | grep perf
>> [26199.880924] perf: interrupt took too long (4839 > 2500), lowering kernel.perf_event_max_sample_rate to 41100

sysctl -w kernel.perf_event_max_sample_rate=100000
(default: unknown, varied)

sysctl -w kernel.perf_cpu_time_max_percent=75
(default: 25)

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