Tomohiro Misono (Fujitsu) <misono.tomohiro@xxxxxxxxxxx> writes: >> Subject: [PATCH v6 00/10] Enable haltpoll on arm64 >> >> This patchset enables the cpuidle-haltpoll driver and its namesake >> governor on arm64. This is specifically interesting for KVM guests by >> reducing IPC latencies. >> >> Comparing idle switching latencies on an arm64 KVM guest with >> perf bench sched pipe: >> >> usecs/op %stdev >> >> no haltpoll (baseline) 13.48 +- 5.19% >> with haltpoll 6.84 +- 22.07% > > I got similar results with VM on Grace machine (applied to 6.10). Great. Thanks for testing. > [default] > # cat /sys/devices/system/cpu/cpuidle/current_driver > none > # perf bench sched pipe > # Running 'sched/pipe' benchmark: > # Executed 1000000 pipe operations between two processes > > Total time: 23.832 [sec] > > 23.832644 usecs/op > 41959 ops/sec > > [With "cpuidle-haltpoll.force=1" commandline] > # cat /sys/devices/system/cpu/cpuidle/current_driver > haltpoll > # perf bench sched pipe > # Running 'sched/pipe' benchmark: > # Executed 1000000 pipe operations between two processes > > Total time: 6.340 [sec] > > 6.340116 usecs/op > 157725 ops/sec > > Tested-by: Misono Tomohiro <misono.tomohiro@xxxxxxxxxxx> Thanks! -- ankur
