[LAU] 2.6.39.1 Xruns last longer!! (was: 2.6.39.1 threadirqs vs. the rest: some numbers)

Hi all, I just built a threaded-irqs enabled 2.6.39.1 kernel and used cyclictest to try to get an initial feeling of how good it might be. Cyclictest tests scheduling delays of the kernel it is running on[*]. These tests were run on a Fedora 13 T510 Lenovo laptop, with the ugly binary Nvidia driver (caveat emptor). In the menu: 2.6.39.1 with threaded irqs and PREEMPT active 2.6.33.13-rt31 2.6.34.8-rt31 (a forward port of rt31 to 2.6.34) plain Fedora kernel (2.6.34.8-68.fc13.i686.PAE) Now, before someone points it out, this is just a synthetic test that measures scheduling latency, not a real audio application. See below for details... (look at the "Avg:" and "Max:" latency values, those are in microseconds) Unless I have done something wrong, it looks like we have a long way to go with regards to scheduling latency in anything other than 2.6.33 + rt patches. But, with threaded irqs in 2.6.39 maybe the performance with audio applications running under jack will be good anyway as we will be able to tune irq processing. Seems to me unlikely. I have not tested that yet. Tests were done after a clean reboot, initially with the machine idle and then while loading thunderbird with tons of emails and firefox with tons of pages. No audio work. YMMV... -- Fernando [*] https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO ---------------------------------------------------------------------- LENOVO T510 ---------------------------------------------------------------------- 2.6.33.13-149.rt31.2.fc13.ccrma.i686.rtPAE ---------------------------------------------------------------------- $ while true ; do ./cyclictest -t1 -p 80 -n -i 10000 -l 10000 ; done policy: fifo: loadavg: 0.02 0.20 0.11 1/405 7024 T: 0 ( 7024) P:80 I:10000 C: 10000 Min: 3 Act: 75 Avg: 54 Max: 121 policy: fifo: loadavg: 0.08 0.17 0.10 2/405 7027 T: 0 ( 7026) P:80 I:10000 C: 10000 Min: 3 Act: 73 Avg: 75 Max: 126 policy: fifo: loadavg: 0.01 0.12 0.09 1/405 7029 T: 0 ( 7029) P:80 I:10000 C: 10000 Min: 3 Act: 90 Avg: 49 Max: 141 policy: fifo: loadavg: 0.37 0.21 0.12 1/405 7031 T: 0 ( 7031) P:80 I:10000 C: 10000 Min: 4 Act: 70 Avg: 76 Max: 148 policy: fifo: loadavg: 0.27 0.21 0.12 1/405 7033 T: 0 ( 7033) P:80 I:10000 C: 10000 Min: 4 Act: 46 Avg: 73 Max: 144 policy: fifo: loadavg: 0.15 0.20 0.12 1/405 7035 T: 0 ( 7035) P:80 I:10000 C: 10000 Min: 3 Act: 90 Avg: 77 Max: 142 policy: fifo: loadavg: 0.07 0.15 0.11 2/405 7037 T: 0 ( 7037) P:80 I:10000 C: 10000 Min: 3 Act: 16 Avg: 71 Max: 135 policy: fifo: loadavg: 0.05 0.12 0.10 1/405 7040 T: 0 ( 7039) P:80 I:10000 C: 10000 Min: 3 Act: 84 Avg: 72 Max: 142 policy: fifo: loadavg: 0.01 0.08 0.08 1/405 7042 T: 0 ( 7042) P:80 I:10000 C: 10000 Min: 3 Act: 105 Avg: 51 Max: 146 policy: fifo: loadavg: 0.00 0.05 0.07 1/406 7045 T: 0 ( 7044) P:80 I:10000 C: 10000 Min: 4 Act: 11 Avg: 50 Max: 121 policy: fifo: loadavg: 0.07 0.06 0.07 1/406 7047 T: 0 ( 7047) P:80 I:10000 C: 10000 Min: 2 Act: 73 Avg: 76 Max: 140 policy: fifo: loadavg: 0.01 0.04 0.06 1/406 7049 T: 0 ( 7049) P:80 I:10000 C: 10000 Min: 3 Act: 67 Avg: 70 Max: 137 policy: fifo: loadavg: 0.02 0.04 0.06 1/406 7051 T: 0 ( 7051) P:80 I:10000 C: 9573 Min: 3 Act: 68 Avg: 47 Max: 146 policy: fifo: loadavg: 0.02 0.04 0.06 1/406 7053 ---------------------------------------------------------------------- 2.6.34.8-68.fc13.i686.PAE ---------------------------------------------------------------------- $ while true ; do ./cyclictest -t1 -p 80 -n -i 10000 -l 10000 ; sleep 10; done policy: fifo: loadavg: 0.20 0.33 0.15 1/298 2559 T: 0 ( 2521) P:80 I:10000 C: 10000 Min: 3 Act: 12 Avg: 36 Max: 354 policy: fifo: loadavg: 0.34 0.30 0.16 1/332 2676 T: 0 ( 2583) P:80 I:10000 C: 10000 Min: 3 Act: 12 Avg: 31 Max: 1749 policy: fifo: loadavg: 0.39 0.38 0.20 1/350 2835 T: 0 ( 2726) P:80 I:10000 C: 10000 Min: 2 Act: 9 Avg: 33 Max: 12861 policy: fifo: loadavg: 0.11 0.29 0.18 2/350 2839 T: 0 ( 2838) P:80 I:10000 C: 10000 Min: 3 Act: 12 Avg: 43 Max: 133 policy: fifo: loadavg: 0.02 0.19 0.16 1/348 2842 T: 0 ( 2842) P:80 I:10000 C: 10000 Min: 4 Act: 75 Avg: 48 Max: 17789 policy: fifo: loadavg: 0.07 0.15 0.14 1/347 2858 T: 0 ( 2845) P:80 I:10000 C: 10000 Min: 4 Act: 56 Avg: 50 Max: 1808 policy: fifo: loadavg: 0.18 0.15 0.14 1/347 2861 T: 0 ( 2861) P:80 I:10000 C: 10000 Min: 3 Act: 11 Avg: 52 Max: 187 policy: fifo: loadavg: 0.34 0.19 0.15 1/345 2864 T: 0 ( 2864) P:80 I:10000 C: 10000 Min: 4 Act: 69 Avg: 46 Max: 119 policy: fifo: loadavg: 0.39 0.28 0.19 1/346 2869 T: 0 ( 2867) P:80 I:10000 C: 10000 Min: 3 Act: 14 Avg: 27 Max: 361 policy: fifo: loadavg: 0.10 0.20 0.17 1/347 2875 T: 0 ( 2872) P:80 I:10000 C: 10000 Min: 4 Act: 14 Avg: 31 Max: 425 policy: fifo: loadavg: 0.01 0.13 0.15 1/346 2882 T: 0 ( 2879) P:80 I:10000 C: 10000 Min: 4 Act: 58 Avg: 55 Max: 186 policy: fifo: loadavg: 0.09 0.12 0.13 1/346 2887 T: 0 ( 2885) P:80 I:10000 C: 10000 Min: 4 Act: 67 Avg: 50 Max: 129 policy: fifo: loadavg: 0.10 0.12 0.13 1/347 2890 ---------------------------------------------------------------------- 2.6.39.1-1.threadirqs.1.fc14.ccrma.i686.PAE ---------------------------------------------------------------------- $ while true ; do ./cyclictest -t1 -p 80 -n -i 10000 -l 10000 ; sleep 10; done policy: fifo: loadavg: 0.13 0.25 0.12 1/290 2279 T: 0 ( 2279) P:80 I:10000 C: 10000 Min: 5 Act: 42 Avg: 45 Max: 1015 policy: fifo: loadavg: 0.64 0.36 0.18 1/338 2567 T: 0 ( 2299) P:80 I:10000 C: 10000 Min: 4 Act: 48 Avg: 44 Max: 3124 policy: fifo: loadavg: 0.20 0.30 0.18 1/337 2583 T: 0 ( 2571) P:80 I:10000 C: 10000 Min: 3 Act: 43 Avg: 50 Max: 10301 policy: fifo: loadavg: 0.07 0.22 0.16 2/341 2592 T: 0 ( 2586) P:80 I:10000 C: 10000 Min: 5 Act: 30 Avg: 46 Max: 15227 policy: fifo: loadavg: 0.48 0.33 0.21 3/340 2602 T: 0 ( 2595) P:80 I:10000 C: 10000 Min: 4 Act: 7 Avg: 29 Max: 992 policy: fifo: loadavg: 0.17 0.28 0.21 1/340 2613 T: 0 ( 2610) P:80 I:10000 C: 10000 Min: 3 Act: 15 Avg: 32 Max: 99 policy: fifo: loadavg: 0.34 0.27 0.21 4/346 2660 T: 0 ( 2616) P:80 I:10000 C: 10000 Min: 3 Act: 14 Avg: 36 Max: 1326 policy: fifo: loadavg: 0.14 0.25 0.22 2/342 2680 T: 0 ( 2665) P:80 I:10000 C: 10000 Min: 3 Act: 14 Avg: 38 Max: 709 policy: fifo: loadavg: 0.18 0.24 0.22 1/342 2687 T: 0 ( 2683) P:80 I:10000 C: 10000 Min: 4 Act: 17 Avg: 44 Max: 17692 policy: fifo: loadavg: 0.15 0.23 0.22 1/343 2690 ---------------------------------------------------------------------- 2.6.34.8-68.rt0.3.fc13.ccrma.i686.rtPAE ---------------------------------------------------------------------- while true ; do ./cyclictest -t1 -p 80 -n -i 10000 -l 10000 ; sleep 10; done policy: fifo: loadavg: 0.19 0.30 0.13 1/355 2561 T: 0 ( 2542) P:80 I:10000 C: 10000 Min: 3 Act: 27 Avg: 33 Max: 143 policy: fifo: loadavg: 0.03 0.20 0.11 1/354 2565 T: 0 ( 2564) P:80 I:10000 C: 10000 Min: 6 Act: 15 Avg: 55 Max: 135 policy: fifo: loadavg: 0.53 0.27 0.14 3/401 2780 T: 0 ( 2568) P:80 I:10000 C: 10000 Min: 3 Act: 9 Avg: 21 Max: 134 policy: fifo: loadavg: 0.50 0.39 0.20 1/405 2899 T: 0 ( 2869) P:80 I:10000 C: 10000 Min: 3 Act: 66 Avg: 36 Max: 119 policy: fifo: loadavg: 0.13 0.28 0.18 1/404 2902 T: 0 ( 2902) P:80 I:10000 C: 10000 Min: 3 Act: 48 Avg: 31 Max: 116 policy: fifo: loadavg: 0.10 0.27 0.17 1/405 2905 _______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-user