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

[Sergei Shtylyov]

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

WBR, Sergei
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