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Message-ID: <1387689024.5412.49.camel@marge.simpson.net> Date: Sun, 22 Dec 2013 06:10:24 +0100 From: Mike Galbraith <bitbucket@...ine.de> To: muli.baron@...il.com Cc: linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org Subject: Re: CONFIG_NO_HZ_FULL + CONFIG_PREEMPT_RT_FULL = nogo On Sun, 2013-12-22 at 05:17 +0100, Mike Galbraith wrote: > On Sat, 2013-12-21 at 19:21 +0200, Muli Baron wrote: > > On 21/12/2013 11:11, Mike Galbraith wrote: > > > > > > Works, modulo noisy workqueues. > > > > > > rtbox:~ # sleep 35 && killall pert& cgexec -g cpuset:rtcpus taskset -c 3 pert 5 > > > [1] 5660 > > > 2400.05 MHZ CPU > > > perturbation threshold 0.018 usecs. > > > pert/s: 33 >15.75us: 2 min: 0.04 max: 24.14 avg: 2.51 sum/s: 84us overhead: 0.01% > > > pert/s: 35 >15.54us: 3 min: 0.04 max: 24.89 avg: 2.39 sum/s: 84us overhead: 0.01% > > > pert/s: 30 >15.27us: 2 min: 0.04 max: 23.03 avg: 2.64 sum/s: 80us overhead: 0.01% > > > pert/s: 34 >15.12us: 3 min: 0.04 max: 25.03 avg: 2.51 sum/s: 86us overhead: 0.01% > > > pert/s: 31 >14.93us: 2 min: 0.04 max: 23.86 avg: 2.60 sum/s: 83us overhead: 0.01% > > > Terminated > > > > > > > I can confirm this works for me as well, but I have noticed some strange behavior under certain > > conditions. > > Hm, so can I. Same everything, different day, nohz_full is NOT working. DL980 with same rt7 patchset/config, but with nohz_full=55-63 can take a while to make up its mind, but does kick in (this boot anyway). vogelweide:/abuild/mike/:[0]# cgexec -g cpuset:rtcpus taskset -c 60 pert 5 2260.90 MHZ CPU perturbation threshold 0.024 usecs. pert/s: 1000 >10.20us: 7 min: 7.21 max: 11.28 avg: 8.00 sum/s: 8000us overhead: 0.80% pert/s: 600 >10.92us: 5 min: 1.64 max: 26.90 avg: 7.81 sum/s: 4690us overhead: 0.47% pert/s: 1000 >10.79us: 4 min: 7.08 max: 11.49 avg: 7.86 sum/s: 7863us overhead: 0.79% pert/s: 1000 >10.70us: 5 min: 7.15 max: 11.90 avg: 7.88 sum/s: 7878us overhead: 0.79% pert/s: 937 >10.57us: 5 min: 4.30 max: 11.06 avg: 7.81 sum/s: 7324us overhead: 0.73% pert/s: 1 >9.99us: 0 min: 4.10 max: 5.03 avg: 4.45 sum/s: 4us overhead: 0.00% pert/s: 1 >9.77us: 1 min: 4.40 max: 10.13 avg: 5.49 sum/s: 7us overhead: 0.00% pert/s: 2 >14.79us: 3 min: 2.65 max:104.68 avg: 15.21 sum/s: 30us overhead: 0.00% pert/s: 1 >13.84us: 0 min: 4.31 max: 5.86 avg: 4.82 sum/s: 5us overhead: 0.00% pert/s: 1 >13.18us: 0 min: 4.03 max: 9.17 avg: 5.19 sum/s: 6us overhead: 0.00% pert/s: 1 >12.69us: 0 min: 2.83 max: 10.65 avg: 5.85 sum/s: 8us overhead: 0.00% vogelweide:/abuild/mike/:[0]# cgexec -g cpuset:rtcpus taskset -c 60 pert 5 2260.90 MHZ CPU perturbation threshold 0.024 usecs. pert/s: 1 >9.11us: 2 min: 2.87 max: 11.95 avg: 6.12 sum/s: 10us overhead: 0.00% pert/s: 1 >9.09us: 2 min: 3.09 max: 11.75 avg: 6.04 sum/s: 8us overhead: 0.00% pert/s: 1 >22.94us: 2 min: 2.73 max:262.06 avg: 33.14 sum/s: 60us overhead: 0.01% pert/s: 1 >21.53us: 0 min: 2.85 max: 12.02 avg: 5.69 sum/s: 7us overhead: 0.00% pert/s: 1 >20.26us: 0 min: 3.38 max: 11.94 avg: 5.67 sum/s: 7us overhead: 0.00% pert/s: 1 >19.12us: 0 min: 2.89 max: 12.11 avg: 5.72 sum/s: 7us overhead: 0.00% pert/s: 1 >18.05us: 0 min: 3.12 max: 11.28 avg: 5.58 sum/s: 7us overhead: 0.00% pert/s: 1 >17.24us: 0 min: 2.85 max: 13.20 avg: 6.72 sum/s: 9us overhead: 0.00% pert/s: 2 >26.85us: 1 min: 2.70 max:201.53 avg: 24.99 sum/s: 50us overhead: 0.00% pert/s: 1 >25.00us: 0 min: 2.81 max: 11.19 avg: 5.56 sum/s: 7us overhead: 0.00% pert/s: 1 >23.33us: 0 min: 3.16 max: 11.11 avg: 5.59 sum/s: 7us overhead: 0.00% pert/s: 1 >21.90us: 0 min: 2.87 max: 11.50 avg: 6.47 sum/s: 10us overhead: 0.00% pert/s: 1 >20.57us: 0 min: 2.87 max: 11.21 avg: 5.99 sum/s: 8us overhead: 0.00% pert/s: 1 >19.37us: 0 min: 3.22 max: 11.51 avg: 5.64 sum/s: 7us overhead: 0.00% pert/s: 1 >18.26us: 0 min: 3.26 max: 10.72 avg: 5.97 sum/s: 8us overhead: 0.00% pert/s: 1 >27.90us: 1 min: 2.67 max:202.74 avg: 26.52 sum/s: 48us overhead: 0.00% Hm, size hefty perturbations every 30 seconds (sniff.. eau de vmstat). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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