* tbr/decrementer and SMP -- do the cpus stay in sync?
@ 2004-10-18 20:58 Chris Friesen
2004-10-18 23:46 ` Benjamin Herrenschmidt
0 siblings, 1 reply; 2+ messages in thread
From: Chris Friesen @ 2004-10-18 20:58 UTC (permalink / raw)
To: linuxppc-dev
I thought I remembered some discussion on this a while back, but I can't find it
in my archived messages or online, so here goes.
With SMP PowerPC machines (specifically the dual G5) we sync up the timebase
when we bring up the second CPU. Are we guaranteed that they stay in sync after
that point, or will they drift? If they drift, do we have any idea how much?
Thanks,
Chris
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: tbr/decrementer and SMP -- do the cpus stay in sync?
2004-10-18 20:58 tbr/decrementer and SMP -- do the cpus stay in sync? Chris Friesen
@ 2004-10-18 23:46 ` Benjamin Herrenschmidt
0 siblings, 0 replies; 2+ messages in thread
From: Benjamin Herrenschmidt @ 2004-10-18 23:46 UTC (permalink / raw)
To: Chris Friesen; +Cc: linuxppc-dev
On Tue, 2004-10-19 at 06:58, Chris Friesen wrote:
> I thought I remembered some discussion on this a while back, but I can't find it
> in my archived messages or online, so here goes.
>
> With SMP PowerPC machines (specifically the dual G5) we sync up the timebase
> when we bring up the second CPU. Are we guaranteed that they stay in sync after
> that point, or will they drift? If they drift, do we have any idea how much?
Yes. They have the same clock source. They won't drift.
Ben.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2004-10-18 20:58 tbr/decrementer and SMP -- do the cpus stay in sync? Chris Friesen
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