From: Wolfgang Grandegger <wg@domain.hid>
To: roland Tollenaar <rolandtollenaar@domain.hid>
Cc: Xenomai-help@domain.hid, Jan Kiszka <jan.kiszka@domain.hid>
Subject: Re: [Xenomai-help] Latencies due to RT-Socket-CAN register accesses
Date: Tue, 24 Apr 2007 14:44:44 +0200 [thread overview]
Message-ID: <462DFBBC.2030408@domain.hid> (raw)
In-Reply-To: <bc4264770704240519yc5558e8y869cdc44f9d0e3fa@domain.hid>
roland Tollenaar wrote:
> damn was not finished with this mail, silly webinterface.
>
>> > warming up...
>> > RTT| 00:00:01 (periodic user-mode task, 100 us period, priority 99)
>> > RTH|--lat min|---lat avg|-----lat max|-overrun|----lat best|---lat
>> worst
>> > RTD| 24.304| 35.199| 65.371| 0| 24.304|
>> 65.371
>>
>> Mind you this is slightly higher than when I run with a kernel without
>> i-pipe tracing enabled. Then it is more like
>>
> 20 30 50 etc
>
>
>
>>
>> >
>> > Can the TSC cause such high delays?
>> >
>> > And what is the output of "/proc/xenomai/latency"?
>
> 5866
>
> Does that make sense to you? What does it mean?
That just means that you have to add this figure to the measured
latencies. It looks to me, that the TSC emulation is the cause of the
problem.
Wolfgang.
next prev parent reply other threads:[~2007-04-24 12:44 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-13 10:52 [Xenomai-help] Latencies due to RT-Socket-CAN register accesses Wolfgang Grandegger
2007-03-13 13:16 ` [Xenomai-help] " Roland Tollenaar
2007-03-13 13:29 ` Wolfgang Grandegger
2007-03-13 13:41 ` Roland Tollenaar
2007-03-13 14:06 ` Wolfgang Grandegger
2007-03-14 9:33 ` Wolfgang Grandegger
2007-03-28 17:05 ` roland Tollenaar
2007-03-28 18:50 ` Wolfgang Grandegger
2007-03-29 2:17 ` Roland Tollenaar
2007-03-29 8:38 ` Stéphane ANCELOT
2007-03-29 8:59 ` Wolfgang Grandegger
2007-03-29 16:44 ` Roland Tollenaar
2007-03-29 18:51 ` Gilles Chanteperdrix
2007-03-29 18:59 ` Wolfgang Grandegger
2007-04-23 15:09 ` [Xenomai-help] " roland Tollenaar
2007-04-23 18:28 ` Gilles Chanteperdrix
2007-04-24 8:44 ` roland Tollenaar
2007-04-24 8:56 ` Gilles Chanteperdrix
2007-04-24 10:27 ` roland Tollenaar
2007-04-24 10:27 ` roland Tollenaar
2007-04-24 12:57 ` Gilles Chanteperdrix
2007-04-24 18:36 ` roland Tollenaar
2007-04-24 9:05 ` Jan Kiszka
2007-04-24 10:31 ` roland Tollenaar
2007-04-24 10:51 ` Jan Kiszka
2007-04-24 12:14 ` roland Tollenaar
2007-04-24 12:32 ` Jan Kiszka
2007-04-24 10:57 ` Wolfgang Grandegger
2007-04-24 11:00 ` Jan Kiszka
2007-04-24 12:17 ` roland Tollenaar
2007-04-24 12:19 ` roland Tollenaar
2007-04-24 12:44 ` Wolfgang Grandegger [this message]
2007-04-25 9:04 ` Stéphane ANCELOT
2007-04-25 11:02 ` Roland Tollenaar
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