linux-kernel - Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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Message-Id: <C7DC371B-46A3-427D-A914-C5C5D23BCE12@kernel.crashing.org>
Date:	Wed, 11 Jul 2007 02:10:10 +0200
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Gabriel Paubert <paubert@...m.es>,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

>>> This scales with the number of processors since there is one
>>> decrementer per core (is it per thread on SMT chips?
>>> I don't know).
>>
>> One per core.
>
> No, each thread has its own decrementer, but the timebase is shared.

Argh, of course you're right, I'm reading the wrong ISA
version again.  Sorry.


Segher

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