Messages in this thread | | | Date | Fri, 18 May 2007 19:06:04 +0400 | From | Sergei Shtylyov <> | Subject | Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver |
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Daniel Walker wrote:
>>I haven't looked at all the new clock/timer code, is there any >>utility in having support for more than one clock source?
> There is if the main clocksource has some issues where it can't be used.
You mean, having more than one clocksource is *useful* in this case?
> On x86 there are lots of different issues with the clocks, so they have > to get switches once in a while. For instance, if the TSC changes > frequencies then it can't be used, or if the TSC stops in different > power states , it can't be used..
Yeah, and there's the rating systems for both clock sources/events.
> Anything like that on PowerPC?
Well, the decrementer frequency may change, at least in theory (if the bus clock changes).
> Daniel
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