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Questions - hyperthreading

Why SCHED_FIFO threads are assigned to the same physical CPU even though idle CPUs are available?

While debugging some performance issue in app I'm working on, I found out weird behaviour of kernel scheduler. It seems that busy SCHED_FIFO tasks tend to be scheduled on logical cores from the same p...
test-img

terion

linux

performance

kernel

scheduler

hyperthreading

Votes: 0

Answers: 2

Latest Answer

The problem was caused by this particular change: https://lkml.iu.edu/hypermail/linux/kernel/1806.0/04887.html Per CPU core watchdog threads were removed watchdog_set_prio(SCHED_FIFO, MAX_RT_PRIO - 1)...
test-img

terion

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