From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: "Segher Boessenkool" <segher@koffie.nl>
Cc: <linuxppc-dev@lists.linuxppc.org>
Subject: Re: RFC: Performance Monitor Counters device
Date: Mon, 16 Sep 2002 14:38:07 +0200 [thread overview]
Message-ID: <20020916123807.15088@192.168.4.1> (raw)
In-Reply-To: <3D831D5A.BF11BC0D@koffie.nl>
>It does not exist on 7450 etc.
>It exists on 7410 before version 1.3 .
>I have no data on 7400.
>It does not exist on 750 etc.
>
>[As my only G4 is a 7410 version 1.3, I won't be affected by this. Hurray.]
I had it happening on 7400.
>The problem itself: if two of thermal assist, decrementer, performance
>monitor interrupts happen within 1 cycle of each other, evil things
>happen with SRR0 and SRR1, so that the return address becomes
>unrecoverable.
>
>Suggested solution:
>
>We can forget about thermal assist, as the TAU on all 74xx is broken
>and unsupported. (Says those same errata sheets).
>If necessary, it's possible to disable the decrementer interrupt and have
>the performance monitor perform its function.
>
>But I won't run into this, so I'm happy for now :)
We can't disable the DEC that easily as it's the primary timer
source of the kernel ;)
Ben.
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-09-16 12:38 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-12 20:03 RFC: Performance Monitor Counters device Segher Boessenkool
2002-09-12 9:52 ` Benjamin Herrenschmidt
2002-09-12 21:45 ` Segher Boessenkool
2002-09-12 10:25 ` Benjamin Herrenschmidt
2002-09-14 11:28 ` Segher Boessenkool
2002-09-15 12:50 ` samuel
2002-09-16 12:38 ` Benjamin Herrenschmidt [this message]
2002-09-16 23:50 ` Segher Boessenkool
2002-09-13 3:32 ` Paul Mackerras
2002-09-14 11:36 ` Segher Boessenkool
2002-09-13 10:04 ` Anton Blanchard
2002-09-14 11:39 ` Segher Boessenkool
2002-09-13 22:21 ` David Engebretsen
2002-09-14 11:22 ` Segher Boessenkool
2002-09-16 15:14 ` Dave Engebretsen
2002-09-17 4:59 ` Segher Boessenkool
2002-09-14 4:41 ` Ethan Benson
2002-09-15 1:37 ` Rob Latham
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