On Mon, Dec 4, 2017 at 9:11 PM, Daniel Bristot de Oliveira <daniel@xxxxxxxxxx> wrote: > > > 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. I understand the comments that comes later, but not this one above. Can you please explain? Thanks >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
