From: Albert Cahalan <albert@users.sf.net>
To: linux-kernel mailing list <linux-kernel@vger.kernel.org>
Cc: mikpe@csd.uu.se, benh@kernel.crashing.org
Subject: Re: [PATCH][2.6.9-rc2-mm3] perfctr ppc32 preliminary interrupt support
Date: 27 Sep 2004 16:05:31 -0400 [thread overview]
Message-ID: <1096315531.1296.21.camel@cube> (raw)
Benjamin Herrenschmidt writes:
> Be careful that some G4's have a bug which can cause a
> perf monitor interrupt to crash your kernel :( Basically, the
> problem is if any of TAU or PerfMon interrupt happens at the
> same time as a DEC interrupt, some revs of the CPU can get
> confused and lose the previous exception state.
Instead of excluding all these CPUs, simply put the
clock tick on the PerfMon interrupt. There's a bit-flip
that'll go at about 4 kHz on a system with a 100 MHz bus.
That should do. One need not change HZ; the interrupt
can be ignored whenever the timebase hasn't advanced
enough to require another clock tick.
next reply other threads:[~2004-09-27 20:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-27 20:05 Albert Cahalan [this message]
2004-09-27 22:54 ` [PATCH][2.6.9-rc2-mm3] perfctr ppc32 preliminary interrupt support Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2004-09-29 11:48 Mikael Pettersson
2004-09-27 0:25 Mikael Pettersson
2004-09-27 0:36 ` Benjamin Herrenschmidt
2004-09-26 23:05 Mikael Pettersson
2004-09-26 23:49 ` Benjamin Herrenschmidt
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