From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: Clark Williams <williams@redhat.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [ANNOUNCE] 4.4-rc6-rt1
Date: Fri, 01 Jan 2016 08:19:41 +0100 [thread overview]
Message-ID: <1451632781.9800.22.camel@gmail.com> (raw)
In-Reply-To: <20151231102441.581ce1e1@sluggy.hsv.redhat.com>
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
swapper 0 [003] 392.708323: timer:hrtimer_cancel: hrtimer=0xffff88041ecce720
swapper 0 [003] 392.708324: timer:hrtimer_expire_entry: hrtimer=0xffff88041ecce720 now=392697118535 function=tick_sched_timer/0x0
swapper 0 [003] 392.708325: timer:hrtimer_expire_exit: hrtimer=0xffff88041ecce720
swapper 0 [003] 392.708326: timer:hrtimer_start: hrtimer=0xffff88041ecce720 function=tick_sched_timer/0x0 expires=392700750000 softexpires=392700750000
swapper 0 [003] 392.708328: timer:tick_stop: success=yes msg=
swapper 0 [003] 392.708329: timer:hrtimer_cancel: hrtimer=0xffff88041ecce720
swapper 0 [003] 392.708329: timer:hrtimer_start: hrtimer=0xffff88041ecce720 function=tick_sched_timer/0x0 expires=4294990471 softexpires=4294990471
swapper 0 [003] 392.708331: timer:hrtimer_cancel: hrtimer=0xffff88041ecce720
swapper 0 [003] 392.708332: timer:hrtimer_expire_entry: hrtimer=0xffff88041ecce720 now=392697126313 function=tick_sched_timer/0x0
swapper 0 [003] 392.708333: timer:hrtimer_expire_exit: hrtimer=0xffff88041ecce720
swapper 0 [003] 392.708334: timer:hrtimer_start: hrtimer=0xffff88041ecce720 function=tick_sched_timer/0x0 expires=392700750000 softexpires=392700750000
swapper 0 [003] 392.708336: timer:tick_stop: success=yes msg=
next prev parent reply other threads:[~2016-01-01 7:19 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-23 22:57 [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior
2015-12-31 16:24 ` Clark Williams
2016-01-01 7:19 ` Mike Galbraith [this message]
2016-01-01 9:14 ` Thomas Gleixner
2016-01-01 9:45 ` Mike Galbraith
[not found] ` <568CF08F.3070001@caviumnetworks.com>
2016-01-13 11:45 ` [ANNOUNCE] 4.4-rc6-rt1 (arm64) Jaggi, Manish
2016-01-13 13:45 ` Sebastian Andrzej Siewior
2016-01-14 11:50 ` Jaggi, Manish
2016-01-13 17:58 ` [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior
2016-01-13 18:36 ` Grygorii Strashko
2016-01-14 14:59 ` Sebastian Andrzej Siewior
2016-01-14 9:33 ` Mike Galbraith
2016-01-14 14:17 ` Sebastian Andrzej Siewior
2016-01-14 14:29 ` Mike Galbraith
2016-01-14 14:30 ` Thomas Gleixner
2016-01-14 14:57 ` Mike Galbraith
2016-01-14 15:07 ` Thomas Gleixner
2016-01-14 16:05 ` Mike Galbraith
2016-01-16 13:23 ` Mike Galbraith
2016-01-16 13:43 ` Thomas Gleixner
2016-01-16 13:52 ` Mike Galbraith
2016-01-16 13:59 ` Thomas Gleixner
2016-01-16 14:09 ` Mike Galbraith
2016-01-07 12:15 ` Tim Sander
2016-01-13 13:40 ` Sebastian Andrzej Siewior
2016-01-22 15:35 ` Grygorii Strashko
2016-01-22 15:48 ` Sebastian Andrzej Siewior
2016-01-22 20:44 ` Sebastian Andrzej Siewior
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