Richard Cochran wrote:
> On Sat, Apr 09, 2011 at 09:50:16PM +0200, Gilles Chanteperdrix wrote:
>>> Just to have an idea where the issue come from, could you try reverting
>>> all the changes which were made on the tsc and timer? i.e. revert to the
>>> original ipipe_mach_get_tsc and ipipe_mach_set_dec?
>>>
>> The exact commit to revert is this one:
>> http://git.xenomai.org/?p=ipipe-gch.git;a=commitdiff;h=cbd591ed5797f105ff45e04cca3bc939388624ea;hp=a2761e92ecd573bc3a3b068d4ebb7cc06313213c
>
> Okay, with cbd591ed57 reverted, it works fine even without IPIPE_DEBUG.
>
> The performance is still about 20 usec worse than xenomai 2.4 with ipipe
> 2.6.30.
>
>
> |------------+------+---------+-------+---------+---------+---------+----------|
> | 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 |
> | 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 |
>
> |------------+------+---------+-------+---------+---------+---------+----------|
>
> I will try xenomai 2.5 with ipipe 2.6.35 next...
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. You can also play
with the various I-pipe versions, going back in the releases.
Note that with FCSEv4, you probably want "preemptible cache flushes"
with FCSE guaranteed. And of course, please do not enable FCSE_DEBUG for
performances testing.
You can also try and enable the I-pipe tracer. But I am not sure it
works on all versions.
--
Gilles.
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