Con Kolivas <[EMAIL PROTECTED]> writes: > This patch for 2.6.11-rc1 provides a method of providing real time > scheduling to unprivileged users which increasingly is desired for > multimedia workloads.
I ran some jack_test3.2 runs with this, using all the default settings. The results of three runs differ quite significantly for no obvious reason. I can't figure out why the DSP load should vary so much. These may be bogus results. It looks like a libjack bug sometimes causes clients to crash when deactivating. I will investigate more tomorrow, and come up with a fix. For comparison, I also made a couple of runs using the realtime-lsm to grant SCHED_FIFO privileges. There was some variablility, but nowhere near as much (and no crashes). I used schedtool to verify that the jackd threads actually have the expected scheduler type. ============================================ Unprivileged, realtime threads are SCHED_ISO ============================================ *** Terminated Tue Jan 18 23:54:55 CST 2005 *** ************* SUMMARY RESULT **************** Total seconds ran . . . . . . : 300 Number of clients . . . . . . : 20 Ports per client . . . . . . : 4 Frames per buffer . . . . . . : 64 ********************************************* Timeout Count . . . . . . . . :( 3) ( 14) ( 2) XRUN Count . . . . . . . . . : 10 42 3 Delay Count (>spare time) . . : 1 0 0 Delay Count (>1000 usecs) . . : 0 0 0 Delay Maximum . . . . . . . . : 307419 usecs 6492 usecs 19339 usecs Cycle Maximum . . . . . . . . : 858 usecs 866 usecs 860 usecs Average DSP Load. . . . . . . : 37.3 % 14.5 % 37.7 % Average CPU System Load . . . : 10.2 % 4.5 % 10.0 % Average CPU User Load . . . . : 26.6 % 11.4 % 23.8 % Average CPU Nice Load . . . . : 0.0 % 0.0 % 0.0 % Average CPU I/O Wait Load . . : 2.0 % 0.7 % 0.2 % Average CPU IRQ Load . . . . : 0.8 % 0.7 % 0.7 % Average CPU Soft-IRQ Load . . : 0.0 % 0.0 % 0.0 % Average Interrupt Rate . . . : 1730.3 /sec 1695.5 /sec 1694.8 /sec Average Context-Switch Rate . : 11523.1 /sec 6151.1 /sec 11672.2 /sec ********************************************* ================================================== With CAP_SYS_NICE, realtime threads are SCHED_FIFO ================================================== *** Terminated Tue Jan 18 23:41:42 CST 2005 *** ************* SUMMARY RESULT **************** Total seconds ran . . . . . . : 300 Number of clients . . . . . . : 20 Ports per client . . . . . . : 4 Frames per buffer . . . . . . : 64 ********************************************* Timeout Count . . . . . . . . :( 0) ( 0) XRUN Count . . . . . . . . . : 0 0 Delay Count (>spare time) . . : 0 0 Delay Count (>1000 usecs) . . : 0 0 Delay Maximum . . . . . . . . : 331 usecs 201 usecs Cycle Maximum . . . . . . . . : 882 usecs 1017 usecs Average DSP Load. . . . . . . : 40.7 % 41.7 % Average CPU System Load . . . : 11.1 % 10.9 % Average CPU User Load . . . . : 26.7 % 27.7 % Average CPU Nice Load . . . . : 0.0 % 0.0 % Average CPU I/O Wait Load . . : 0.6 % 1.0 % Average CPU IRQ Load . . . . : 0.7 % 0.7 % Average CPU Soft-IRQ Load . . : 0.0 % 0.0 % Average Interrupt Rate . . . : 1708.0 /sec 1697.1 /sec Average Context-Switch Rate . : 13297.0 /sec 13314.8 /sec ********************************************* -- joq - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
