Hi list,
These are my latency results over a custom board based on AT91SAM9260.
Environment:
kernel 2.6.20 + xenomai 2.4.0
Load: dd if=/dev/zero of=/dev/null plus an external ping -f to
stress the ethernet.
The results:
running: ./run -- -p 500 -T 60 -t0 # latency
== Sampling period: 500 us
== Test mode: periodic user-mode task
== All results in microseconds
warming up...
RTT| 00:00:01 (periodic user-mode task, 500 us period, priority 99)
RTH|-----lat min|-----lat avg|-----lat max|-overrun|----lat best|---lat worst
RTD| 45.747| 62.177| 78.286| 0| 45.747| 78.286
.............................................................................
RTD| 39.948| 61.211| 78.286| 0| 39.304| 88.273
---|------------|------------|------------|--------|-------------------------
RTS| 39.304| 61.855| 88.273| 0| 00:01:00/00:01:00
Thu Mar 30 01:51:36 UTC 2000
running: ./run -- -p 500 -T 60 -t1 # latency
== Sampling period: 500 us
== Test mode: in-kernel periodic task
== All results in microseconds
warming up...
RTT| 00:00:01 (in-kernel periodic task, 500 us period, priority 99)
RTH|-----lat min|-----lat avg|-----lat max|-overrun|----lat best|---lat worst
RTD| 19.007| 31.731| 43.813| 0| 19.007| 43.813
.............................................................................
---|------------|------------|------------|--------|-------------------------
RTS| 13.501| 31.126| 71.188| 0| 00:01:00/00:01:00
Thu Mar 30 01:52:52 UTC 2000
running: ./run -- -p 500 -T 60 -t2 # latency
*
*
* Type ^C to stop this application.
*
*
== Sampling period: 500 us
== Test mode: in-kernel timer handler
== All results in microseconds
warming up...
RTT| 00:00:01 (in-kernel timer handler, 500 us period, priority 99)
RTH|-----lat min|-----lat avg|-----lat max|-overrun|----lat best|---lat worst
.............................................................................
---|------------|------------|------------|--------|-------------------------
RTS| -0.977| 8.521| 28.337| 0| 00:01:00/00:01:00
Thu Mar 30 01:54:07 UTC 2000
running: ./run -- -T 120 # switchtest
== Testing FPU check routines...
== FPU check routines: unimplemented, skipping FPU switches tests.
== Threads: sleeper-0 rtk-1 rtk-2 rtup-3 rtup-4 rtus-5 rtus-6 rtuo-7 rtuo-8
RTT| 00:00:01
RTH|ctx switches|-------total
RTD| 756| 756
..............................
RTD| 723| 87717
RTD| 762| 88479
RTD| 750| 89229
RTD| 42| 89271
Thu Mar 30 01:56:22 UTC 2000
running: ./run -- -p500 -h # switchbench
== Sampling period: 500 us
== Do not interrupt this program
RTH| lat min| lat avg| lat max| lost
RTD| 47.358| 52.512| 68.298| 0
---|---range-|---samples
HSD| 47 - 48 | 1
HSD| 48 - 49 | 5
HSD| 49 - 50 | 6
HSD| 50 - 51 | 2065
HSD| 51 - 52 | 22440
HSD| 52 - 53 | 41582
HSD| 53 - 54 | 19749
HSD| 54 - 55 | 11696
HSD| 55 - 56 | 2131
HSD| 56 - 57 | 1
HSD| 60 - 61 | 1
HSD| 62 - 63 | 1
HSD| 63 - 64 | 21
HSD| 64 - 65 | 95
HSD| 65 - 66 | 107
HSD| 66 - 67 | 63
HSD| 67 - 68 | 29
HSD| 68 - 69 | 3
HSS| 99996| 52.271| 1.278
Thu Mar 30 01:57:25 UTC 2000
running: ./run -- -p 10 -n -l 1000 # cyclictest
T: 0 ( 0) P:10 I: 1000 C: 0 Min: 1000000 Act: 0 Avg: 0
Max:-1000000
[3A1.30 1.01 0.63 2/33 2107
...........................................................................................
T: 0 ( 2107) P:10 I: 1000 C: 0 Min: 1000000 Act: 0 Avg: 0
Max:-1000000
[3A1.30 1.01 0.63 2/33 2107
T: 0 ( 2107) P:10 I: 1000 C: 0 Min: 1000000 Act: 0 Avg: 0
Max:-1000000
[3A1.30 1.01 0.63 2/33 2107
T: 0 ( 2107) P:10 I: 1000 C: 0 Min: 1000000 Act: 0 Avg: 0
Max:-1000000
[3A1.30 1.01 0.63 2/33 2107
T: 0 ( 2107) P:10 I: 1000 C: 19 Min: 45 Act: 45 Avg: 69
Max: 78
[3A1.30 1.01 0.63 2/33 2107
...........................................................................................
T: 0 ( 2107) P:10 I: 1000 C: 999 Min: 39 Act: 48 Avg: 65
Max: 84
I see everything OK except for the first samples of cyclictests. Any comments ?
Gilles, I've read your comments on adeos list about the performance
problems which you have to solve before upgrading to 2.6.23. Any news ?
Could you tell me if the above numbers shows the perfomance problem or
if I have to do another kind of test to reproduce it ?
Regards,
Juan Antonio
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