From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jeroen Van den Keybus <jeroen.vandenkeybus@gmail.com>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai] Slow execution of RT task
Date: Mon, 14 Apr 2014 22:33:12 +0200 [thread overview]
Message-ID: <534C4608.9090200@xenomai.org> (raw)
In-Reply-To: <CAPRPZsCkGj=n4LJeduM5MJM0UbAcjwg+5uZkNnAn9dSGwaKeoQ@mail.gmail.com>
On 04/14/2014 10:18 PM, Jeroen Van den Keybus wrote:
>> Do you have CONFIG_NO_HZ_FULL enabled? If so, could you disable it and
>> retry? Next step, same question for CONFIG_NO_HZ_IDLE.
>
> Same results, but now latency figures are somewhat higher:
>
> RTT| 00:00:01 (periodic user-mode task, 100 us period, priority 99)
> RTH|----lat min|----lat avg|----lat max|-overrun|---msw|---lat best|--lat worst
> RTD| 0.035| 0.288| 7.512| 0| 0| 0.035| 7.512
> RTD| -0.661| 0.294| 7.626| 0| 0| -0.661| 7.626
> RTD| -0.680| 0.293| 7.907| 0| 0| -0.680| 7.907
>
> rt_timer_read still requires 1.6 us (or at least that's what I get
> back from rt_timer_read).
Maybe the clocksource is no longer the tsc? What does:
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
say?
--
Gilles.
next prev parent reply other threads:[~2014-04-14 20:33 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-14 9:14 [Xenomai] Slow execution of RT task Jeroen Van den Keybus
2014-04-14 12:28 ` Philippe Gerum
2014-04-14 12:45 ` Jeroen Van den Keybus
2014-04-14 12:53 ` Philippe Gerum
2014-04-15 14:40 ` Philippe Gerum
2014-04-16 9:43 ` Jeroen Van den Keybus
2014-04-16 14:23 ` Philippe Gerum
2014-04-16 20:42 ` Jeroen Van den Keybus
2014-04-24 10:21 ` Jeroen Van den Keybus
2014-04-24 12:17 ` Philippe Gerum
2014-04-14 12:44 ` Philippe Gerum
2014-04-14 12:47 ` Jeroen Van den Keybus
2014-04-14 20:18 ` Jeroen Van den Keybus
2014-04-14 20:33 ` Gilles Chanteperdrix [this message]
2014-04-14 21:14 ` Jeroen Van den Keybus
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