On Sun, Apr 10, 2011 at 11:34:14AM +0200, Gilles Chanteperdrix wrote:
> Richard Cochran wrote:
> > I will try xenomai 2.5 with ipipe 2.6.35 next...
I meant to say, Xenomai 2.4 with ipipe 2.6.35, but this does not work
because the kernel definitions have changed:
include/asm-generic/xenomai/hal.h: In function 'rthal_get_cpufreq':
include/asm-generic/xenomai/hal.h:168: error: 'struct ipipe_sysinfo' has no
member named 'cpufreq'
include/asm-generic/xenomai/hal.h: In function 'rthal_get_timerfreq':
include/asm-generic/xenomai/hal.h:175: error: 'struct ipipe_sysinfo' has no
member named 'archdep'
But I think its not worth the effort to try that combination.
> Ok, please try Xenomai 2.5.6 with I-pipe for 2.6.30, in order to know if
> the difference comes from the I-pipe of from Xenomai.
So here is what I measured. Despite all the performance enhancements
added in Xenomai 2.5, it seems that 2.4 still performs better on my
platform. The difference isn't huge, but it is visible.
|------------+------+------------+-------+---------+---------+---------+----------|
| Kernel | | Xeno | IPIPE | | | |
|
| Vers | FCSE | Vers | DEBUG | lat min | lat avg | lat max |
duration |
|------------+------+------------+-------+---------+---------+---------+----------|
| v30 | yes | v2.4.10 | no | 8.430 | 17.310 | 63.510 |
00:02:35 |
| v30 | yes | v2.5.6 [1] | no | 7.260 | 32.745 | 80.775 |
00:03:09 |
| v30 | yes | v2.5.6 [2] | no | 7.140 | 34.950 | 78.375 |
00:03:21 |
|------------+------+------------+-------+---------+---------+---------+----------|
| v31 | yes | v2.5.6 | no | 7.215 | 34.020 | 85.350 |
00:02:58 |
| v33 | yes | v2.5.6 | yes | 17.250 | 55.815 | 127.516 |
00:02:00 |
| v35 | yes | v2.5.6 | yes | 7.140 | 34.200 | 84.180 |
00:02:17 |
| v35-revert | yes | v2.5.6 | no | 7.350 | 29.430 | 85.185 |
00:05:50 |
| v35 | no | v2.5.6 | no | 6.960 | 109.500 | 214.156 |
00:09:41 |
|------------+------+------------+-------+---------+---------+---------+----------|
[1] CONFIG_IPIPE_WANT_PREEMPTIBLE_SWITCH=y
[2] CONFIG_IPIPE_WANT_PREEMPTIBLE_SWITCH=n
Gilles, I will try your tsc test program later this week...
Thanks,
Richard
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