On Fri, 1 Jan 2016, Mike Galbraith wrote: > On Thu, 2015-12-31 at 10:24 -0600, Clark Williams wrote: > > I pulled this update and tried it on my laptop (i7 quad-core with HT) > > and an Atom testbox. I'm seeing a change in the cpu utilization of > > ksoftirqd between 4.1.15-rt17 and 4.4-rc2-rt1, where the per-cpu > > ksoftirqd threads are running at between 25-40% utilization: > > > > top - 10:15:57 up 13:46, 2 users, load average: 9.44, 9.30, 8.93 > > Tasks: 188 total, 2 running, 186 sleeping, 0 stopped, 0 zombie > > %Cpu(s): 4.7 us, 53.6 sy, 0.0 ni, 37.4 id, 0.1 wa, 0.0 hi, 4.2 si, 0.0 st > > KiB Mem : 4046064 total, 480548 free, 179528 used, 3385988 buff/cache > > KiB Swap: 5177340 total, 5169908 free, 7432 used. 3785624 avail Mem > > > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > > 3 root -2 0 0 0 0 S 37.3 0.0 307:52.44 ksoftirqd/0 > > 32 root -2 0 0 0 0 S 37.3 0.0 308:08.72 ksoftirqd/2 > > 42 root -2 0 0 0 0 R 37.3 0.0 308:32.84 ksoftirqd/3 > > 22 root -2 0 0 0 0 S 26.9 0.0 222:29.82 ksoftirqd/1 > > 1 root 20 0 46628 6980 4976 S 1.3 0.2 0:13.98 systemd > > 22358 williams 20 0 159980 4552 3780 R 1.0 0.1 0:00.39 top > > Heh, I didn't notice immediately because I throttle nohz, am seeing > only tiny utilization (but nohz idle isn't working). With throttle > patch removed, box is screaming, expires=4294990471 pokes eyeball. > > swapper 0 [003] 392.708321: timer:hrtimer_cancel: hrtimer=0xffff88041ecce720 > swapper 0 [003] 392.708321: timer:hrtimer_start: hrtimer=0xffff88041ecce720 function=tick_sched_timer/0x0 expires=4294990471 softexpires=4294990471 There is a major hickup in the hrtimer RT conversion. I'll have a look next week. Thanks, tglx -- 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
