[asterisk-users] Stable clock with 2.6 and without Digium hardware.

[Tzafrir Cohen]

On Fri, Nov 10, 2006 at 03:04:46PM +0200, Anton Tinchev wrote:
> Anybody sucessfully got stable 1000Hz clock without Digium harware and 
> kernel 2.6?
> We need to consult some peoples how to clock asterisk stable with exactly 
> 1000 Hz without much kernel/drives patching/tweaking.
> 
> Some test results we made so far:
> 
> 2.6 with digium card - stable 1000 Hz.

Which card, BTW?

> 2.6 with ztdummy - uses RTC and the clock is 1024, not 1000.
> 2.6 with some Realtime kernel patch - provides stable 1000 Hz for some 
> time, but in moments stops/misses interrupts/goes away from 1000 Hz
> 2.6 with ztdummy USB_UHCI - don't works, needs some tweaking. Somebody 
> knows good patch for it?
> 2.6 with ztdynamic as primary clock sources - some issues with 2.6 
> (ztdynamic not ported well to 2.6?) with the mainstream versions, somehow 
> patches solves it.
> 2.6 with kernel clock - needs kernel recompiling and work stable with 
> switched off kernel Preemption. Long time tests in progress now.

Why does preemption conflict with HZ=1000 ? Totally disable preemption? 

On what system(s)?

> 
> 2.4 with digium card - stable 1000 Hz
> 2.4 with ztdummy UHCI - stable 1000 Hz
> 2.4 with ztdynamic clock source - stable 1000 Hz/Depends on network 
> conditions.

-- 
               Tzafrir Cohen       
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