On Fri, 2011-07-29 at 11:13 -0400, Steven Rostedt wrote: > Hi Mike, > > Could you try this patch set out. Add the first patch and then > run your tests. The first patch only adds benchmarking, and does not > modify the scheduler algorithm. > > Do this: > > 1. apply first patch, build and boot > 2. # mount -t debugfs nodev /sys/kernel/debug > 3. # echo 0 > /sys/kernel/debug/cpupri; ./runtest; cat /sys/kernel/debug/cpupri > output > > The output will give you the contention of the vector locks in the > cpupri algorithm. > > Then apply the second patch and do the same thing. > > Then apply the third patch and do the same thing. > > After that, could you send me the results of the output file for all > three runs? The final patch should probably be the best overall > results. These patches are RFC, so here's my Comment. Steven rocks. Below is what cyclictest has to say with the patches listed below applied, and simulation model running on 56 isolated cores. The model squeaks once in a while with jitter ever so slightly over the 30us squeak threshold, so I have yet more perturbation sources, but wrt your patches, they are mana from heaven for largish boxen ;-) patches/ipc-sem-Optimize-update_queue-for-bulk-wakeup-calls patches/ipc-sem-Move-wake_up_process-out-of-the-spinlock-section patches/ipc-sem-Cacheline-align-the-ipc-spinlock-for-semaphores patches/ipc-sem-Update-description-of-the-implementation patches/ipc-sem-Use-ERR_CAST patches/ipc-sem-Bugfix-for-semop-not-reporting-successful-operation patches/ipc-sys_semctl-Fix-kernel-stack-leakage patches/cpupri-2-3-nolock.patch patches/cpupri-3-3-atomic.patch patches/posix-timers-RCU-conversion cyclictest -Smqp 99 -D 30m; ./killit.sh T: 0 ( 7362) P:99 I:1000 C:1799001 Min: 1 Act: 2 Avg: 1 Max: 19 T: 1 ( 7363) P:99 I:1500 C:1199333 Min: 1 Act: 2 Avg: 1 Max: 4 T: 2 ( 7364) P:99 I:2000 C: 899498 Min: 1 Act: 2 Avg: 1 Max: 4 T: 3 ( 7365) P:99 I:2500 C: 719597 Min: 1 Act: 2 Avg: 1 Max: 4 T: 4 ( 7366) P:99 I:3000 C: 599664 Min: 1 Act: 2 Avg: 1 Max: 4 T: 5 ( 7367) P:99 I:3500 C: 513997 Min: 1 Act: 2 Avg: 1 Max: 5 T: 6 ( 7368) P:99 I:4000 C: 449746 Min: 1 Act: 2 Avg: 1 Max: 4 T: 7 ( 7369) P:99 I:4500 C: 399774 Min: 1 Act: 2 Avg: 1 Max: 4 T: 8 ( 7370) P:99 I:5000 C: 359796 Min: 1 Act: 3 Avg: 2 Max: 5 T: 9 ( 7371) P:99 I:5500 C: 327087 Min: 1 Act: 3 Avg: 2 Max: 7 T:10 ( 7372) P:99 I:6000 C: 299829 Min: 1 Act: 3 Avg: 2 Max: 7 T:11 ( 7373) P:99 I:6500 C: 276765 Min: 1 Act: 3 Avg: 2 Max: 13 T:12 ( 7374) P:99 I:7000 C: 256995 Min: 1 Act: 3 Avg: 2 Max: 6 T:13 ( 7375) P:99 I:7500 C: 239862 Min: 1 Act: 3 Avg: 2 Max: 10 T:14 ( 7376) P:99 I:8000 C: 224870 Min: 1 Act: 2 Avg: 2 Max: 6 T:15 ( 7377) P:99 I:8500 C: 211642 Min: 1 Act: 4 Avg: 2 Max: 7 T:16 ( 7378) P:99 I:9000 C: 199884 Min: 1 Act: 3 Avg: 2 Max: 13 T:17 ( 7379) P:99 I:9500 C: 189364 Min: 1 Act: 4 Avg: 2 Max: 6 T:18 ( 7380) P:99 I:10000 C: 179895 Min: 1 Act: 3 Avg: 2 Max: 5 T:19 ( 7381) P:99 I:10500 C: 171328 Min: 1 Act: 3 Avg: 2 Max: 9 T:20 ( 7382) P:99 I:11000 C: 163540 Min: 1 Act: 4 Avg: 2 Max: 8 T:21 ( 7383) P:99 I:11500 C: 156430 Min: 2 Act: 3 Avg: 2 Max: 7 T:22 ( 7384) P:99 I:12000 C: 149912 Min: 2 Act: 3 Avg: 2 Max: 10 T:23 ( 7385) P:99 I:12500 C: 143915 Min: 2 Act: 3 Avg: 3 Max: 8 T:24 ( 7386) P:99 I:13000 C: 138380 Min: 2 Act: 4 Avg: 3 Max: 7 T:25 ( 7387) P:99 I:13500 C: 133254 Min: 2 Act: 2 Avg: 3 Max: 7 T:26 ( 7388) P:99 I:14000 C: 128495 Min: 1 Act: 3 Avg: 3 Max: 6 T:27 ( 7389) P:99 I:14500 C: 124064 Min: 1 Act: 4 Avg: 3 Max: 10 T:28 ( 7390) P:99 I:15000 C: 119928 Min: 2 Act: 4 Avg: 3 Max: 7 T:29 ( 7391) P:99 I:15500 C: 116059 Min: 2 Act: 3 Avg: 2 Max: 6 T:30 ( 7392) P:99 I:16000 C: 112432 Min: 2 Act: 4 Avg: 3 Max: 6 T:31 ( 7393) P:99 I:16500 C: 109025 Min: 1 Act: 3 Avg: 3 Max: 6 T:32 ( 7394) P:99 I:17000 C: 105818 Min: 2 Act: 4 Avg: 3 Max: 7 T:33 ( 7395) P:99 I:17500 C: 102795 Min: 2 Act: 4 Avg: 3 Max: 7 T:34 ( 7396) P:99 I:18000 C: 99939 Min: 1 Act: 3 Avg: 3 Max: 7 T:35 ( 7397) P:99 I:18500 C: 97238 Min: 2 Act: 4 Avg: 3 Max: 8 T:36 ( 7398) P:99 I:19000 C: 94679 Min: 2 Act: 3 Avg: 3 Max: 7 T:37 ( 7399) P:99 I:19500 C: 92251 Min: 1 Act: 3 Avg: 3 Max: 8 T:38 ( 7400) P:99 I:20000 C: 89945 Min: 2 Act: 4 Avg: 3 Max: 8 T:39 ( 7401) P:99 I:20500 C: 87751 Min: 2 Act: 4 Avg: 3 Max: 13 T:40 ( 7402) P:99 I:21000 C: 85661 Min: 2 Act: 3 Avg: 3 Max: 10 T:41 ( 7403) P:99 I:21500 C: 83669 Min: 1 Act: 3 Avg: 3 Max: 7 T:42 ( 7404) P:99 I:22000 C: 81767 Min: 2 Act: 3 Avg: 3 Max: 10 T:43 ( 7405) P:99 I:22500 C: 79950 Min: 2 Act: 4 Avg: 3 Max: 9 T:44 ( 7406) P:99 I:23000 C: 78212 Min: 1 Act: 2 Avg: 3 Max: 8 T:45 ( 7407) P:99 I:23500 C: 76548 Min: 1 Act: 3 Avg: 3 Max: 7 T:46 ( 7408) P:99 I:24000 C: 74953 Min: 1 Act: 3 Avg: 3 Max: 6 T:47 ( 7409) P:99 I:24500 C: 73423 Min: 1 Act: 3 Avg: 3 Max: 6 T:48 ( 7410) P:99 I:25000 C: 71955 Min: 2 Act: 4 Avg: 3 Max: 7 T:49 ( 7411) P:99 I:25500 C: 70544 Min: 1 Act: 3 Avg: 3 Max: 6 T:50 ( 7412) P:99 I:26000 C: 69187 Min: 2 Act: 4 Avg: 3 Max: 11 T:51 ( 7413) P:99 I:26500 C: 67881 Min: 1 Act: 3 Avg: 3 Max: 6 T:52 ( 7414) P:99 I:27000 C: 66624 Min: 2 Act: 3 Avg: 3 Max: 7 T:53 ( 7415) P:99 I:27500 C: 65413 Min: 1 Act: 4 Avg: 3 Max: 6 T:54 ( 7416) P:99 I:28000 C: 64245 Min: 2 Act: 4 Avg: 3 Max: 6 T:55 ( 7417) P:99 I:28500 C: 63118 Min: 2 Act: 3 Avg: 3 Max: 6 T:56 ( 7418) P:99 I:29000 C: 62029 Min: 2 Act: 3 Avg: 3 Max: 8 T:57 ( 7419) P:99 I:29500 C: 60978 Min: 2 Act: 3 Avg: 2 Max: 5 T:58 ( 7420) P:99 I:30000 C: 59961 Min: 2 Act: 3 Avg: 2 Max: 5 T:59 ( 7421) P:99 I:30500 C: 58978 Min: 2 Act: 3 Avg: 2 Max: 5 T:60 ( 7422) P:99 I:31000 C: 58027 Min: 2 Act: 3 Avg: 3 Max: 10 T:61 ( 7423) P:99 I:31500 C: 57106 Min: 2 Act: 3 Avg: 3 Max: 9 T:62 ( 7424) P:99 I:32000 C: 56213 Min: 2 Act: 2 Avg: 2 Max: 5 T:63 ( 7425) P:99 I:32500 C: 55349 Min: 2 Act: 5 Avg: 3 Max: 6 -- 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
