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

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Message-ID: <18068.5829.53635.797336@cargo.ozlabs.ibm.com>
Date:	Wed, 11 Jul 2007 09:31:17 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Segher Boessenkool <segher@...nel.crashing.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

Segher Boessenkool writes:

> > 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.

Paul.
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