[PlanetCCRMA] [Fedora-music-list] fedora 15 vs. the rt kernel
Fernando Lopez-Lezcano
nando at ccrma.Stanford.EDU
Wed Jun 15 11:52:00 PDT 2011
On 06/15/2011 11:29 AM, Jeff Sandys wrote:
> On Tue, Jun 14, 2011 at 3:11 PM, Fernando Lopez-Lezcano
> <nando at ccrma.stanford.edu <mailto:nando at ccrma.stanford.edu>> wrote:
> Hi all, just a couple of comments about rt patched kernels and
> Fedora 15.
> ...
> my initial tests with the cyclictest utility show higher
> latency hits than rt31.
>
> Just curious, what incantation(s) of cyclictest do use?
(I should have cc'ed the Planet CCRMA list)
This is from an email I sent to the linux audio users mailing list
(there was a thread about latency & kernels in the list)...
----
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)
...
[*] 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
More information about the PlanetCCRMA
mailing list