From: Philippe Gerum <rpm@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] nervous nmi-watchdog
Date: Mon, 05 Jun 2006 18:35:37 +0200 [thread overview]
Message-ID: <44845D59.5040608@domain.hid> (raw)
In-Reply-To: <44736EE4.2060807@domain.hid>
Jan Kiszka wrote:
> Hi,
>
> I'm getting nmi alarms about latency being > 100 us on a dual P-III 1GHz
> (with and without CONFIG_SMP) once I start the latency test tool. But
> the must be false positive. Can someone comment on this trace:
>
Issue confirmed here, on a dual 750 Mhz PIII Celeron. Starting the
latency test, the NMI watchdog pulls the break on cpu #0 after a few us,
albeit rthal_nmi_arm() had been told to trigger the NMI more than a
millisecond in the future (likely the HTICK emulation + 100 us NMI
threshold).
Running a UP + LAPIC enabled kernel on the same hw did not trigger the
spurious NMI, so I'd bet that the issue is SMP related, and not
hw/perfctr related.
--
Philippe.
next prev parent reply other threads:[~2006-06-05 16:35 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-23 20:21 [Xenomai-core] nervous nmi-watchdog Jan Kiszka
2006-06-05 16:35 ` Philippe Gerum [this message]
2006-06-05 19:06 ` Gilles Chanteperdrix
2006-06-05 19:15 ` Philippe Gerum
2006-07-09 12:50 ` Gilles Chanteperdrix
2006-07-09 16:41 ` Philippe Gerum
2006-07-09 16:56 ` Jan Kiszka
2006-07-09 17:07 ` Philippe Gerum
2006-07-09 18:13 ` Jan Kiszka
2006-07-09 19:36 ` Gilles Chanteperdrix
2006-07-10 17:28 ` Gilles Chanteperdrix
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