On Fri, 2005-07-15 at 14:01 +1000, Con Kolivas wrote:
> his makes a large difference to the latencies measured under mem_load
> particularly when running real time benchmarks on a RT-PREEMPT kernel
Here are some results from my 600MHz C3. In realtime mode, the
PREEMPT_RT kernel performs as expected, max latencies are around 55
usecs with a very tight distribution.
Based on what we already know about the RT kernel I think this validates
the benchmark. So the numbers Con posted showing an interactivity
regression from HZ=250 should be taken seriously.
Lee
Realtime mode:
rlrevell@mindpipe:~/kernel-source/interbench-0.21$ ./interbench -r -t 5
84648 loops_per_ms read from file interbench.loops_per_ms
Using 84648 loops per ms, running every load for 10 seconds
Benchmarking kernel 2.6.12-RT-V0.7.51-28 at datestamp 200507160215
--- Benchmarking Audio real time in the presence of loads ---
Latency +/- SD (us) Max Latency % Desired CPU % Deadlines Met
None 35 +/- 3.85 41 100 100
Video 36 +/- 4.15 51 100 100
X 37 +/- 4.39 49 100 100
Burn 34 +/- 4.19 50 100 100
Write 40 +/- 4.9 52 100 100
Read 38 +/- 3.36 46 100 100
Compile 40 +/- 4.11 54 100 100
Memload 41 +/- 4.24 51 100 100
--- Benchmarking Video real time in the presence of loads ---
Latency +/- SD (us) Max Latency % Desired CPU % Deadlines Met
None 29 +/- 4.15 42 100 100
X 28 +/- 3.52 46 100 100
Burn 28 +/- 3.37 41 100 100
Write 41 +/- 3.25 59 100 100
Read 37 +/- 3.07 43 100 100
Compile 36 +/- 4.99 54 100 100
Memload 38 +/- 3.39 48 100 100
Non realtime mode:
rlrevell@mindpipe:~/kernel-source/interbench-0.21$ ./interbench -t 5
84648 loops_per_ms read from file interbench.loops_per_ms
Using 84648 loops per ms, running every load for 10 seconds
Benchmarking kernel 2.6.12-RT-V0.7.51-28 at datestamp 200507160237
--- Benchmarking Audio in the presence of loads ---
Latency +/- SD (ms) Max Latency % Desired CPU % Deadlines Met
None 0.042 +/- 0.0234 0.176 100 100
Video 0.121 +/- 0.926 13 100 100
X 1.35 +/- 2.93 19.4 100 100
Burn 0.067 +/- 0.215 3.02 100 100
Write 0.763 +/- 2.18 16.9 100 100
Read 0.263 +/- 1.12 9.01 100 100
Compile 0.216 +/- 1.06 9.2 100 100
Memload 0.541 +/- 1.86 13.1 100 100
--- Benchmarking Video in the presence of loads ---
Latency +/- SD (ms) Max Latency % Desired CPU % Deadlines Met
None 0.428 +/- 1.07 17 100 97.2
X 4.6 +/- 4.23 50 100 68.3
Burn 0.394 +/- 1.18 16.8 100 97.8
Write 1.31 +/- 2.05 39.4 100 93
Read 0.462 +/- 0.809 18.2 100 96.8
Compile 0.991 +/- 1.67 42.3 100 94.2
Memload 0.558 +/- 0.949 18.9 100 97.2
--- Benchmarking X in the presence of loads ---
Latency +/- SD (ms) Max Latency % Desired CPU % Deadlines Met
None 0.599 +/- 0.599 24 100 95
Video 13.3 +/- 13.4 93 100 64
Burn 0.519 +/- 0.52 15 100 94
Write 1.91 +/- 1.91 77 100 91
Read 0.449 +/- 0.45 20 100 95
Compile 1.01 +/- 1.04 30 100 93
Memload 1.26 +/- 1.26 30 100 88
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