On 12/04/2017 06:06 PM, Ran Shalit wrote: > Hello, > > > I would like to ask if anyone familiar with results showing better > performance during stress. > We expected (and seen) usually degraded performance during stress, so > such result is a surprise. > I use cyclictest and see that both average and maximum have lower > value during stress. > The chip is i7. Stress runs a busy loop in user-space, hence the preempt/irqs are always enabled. Moreover, it avoids letting the processor going to idle, avoiding "exit from idle" latencies. Using a stress thread per CPU will probably give you better results than just letting the system going idle. You should use rteval as a workload: https://wiki.linuxfoundation.org/realtime/documentation/howto/tools/rteval -- Daniel > Thank you. > Ran > -- > To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
