Hi! (hope the subject won't redirect this mail straight in your spam!) I'm using 2.6.39 + thread irqs for several days/weeks, with FFADO (Saffire PRO 40), on a moroless Debian system. I'm really happy with it, it works fine, my DSP load is way lower than before, and I don't have that Big Kernel Lock problem anymore, which is cool. But, when having an Xrun (which occurs very rarely, like once every 6 or 7 hours average), it last really long (I would say something like 2-5 seconds), and is thus highly hearable (sounds really stop, no unsync clics, but a total silence). I wondered whether someone had an explanation about this, as I can't find a reason for that. See you. Aurélien On Mon, Jun 13, 2011 at 05:38:11PM -0700, Fernando Lopez-Lezcano wrote : > 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@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/listinfo/linux-audio-user -- Aurélien _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
