Re: Using %stick where available

[Michael <macallan%netbsd.org@localhost>]

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Hello,

On Nov 6, 2012, at 9:49 PM, Erik Fair wrote:

> On Nov 6, 2012, at 18:37, Michael wrote:
>
> > Good question, I didn't do any measurements other than 'looks ok to  
> > me'.
> > I think there's a bug in the code that's supposed to synchronize  
> > the CPUs' time bases - that could cause crap you'd call 'terrible  
> > timekeeping', like the clock appearing to jump back and forth semi- 
> > randomly ( whenever you hop to a different CPU )
> > Keeping them in sync should be much easier with the time base  
> > running at only 12MHz though.
>
> I have a dual core HP Microserver N40L (AMD Turion II Neo) that  
> keeps quite good time, even when not using the HPET device, which  
> suggests that the amd64 port has the problem of which CPU to get  
> time from solved.

Well, the problem isn't exactly difficult. If it is what I think it is  
it's only one extra, unnecessary settick(0) on the boot CPU which  
happens when initializing the timecounter, some time after syncing  
time bases on SMP boxes.

> I guess I need to test the patches on my v240 ...

Please do. It's likely to have the same problem though, so as long as  
it's not getting worse we're doing good.

have fun
Michael
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