Messages in this thread | | | From | "Ulrich Windl" <> | Date | Fri, 1 May 1998 01:01:46 +0200 | Subject | Re: Problem with kernel-pll in 2.0.3x (at least) |
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On 30 Apr 98 at 23:37, Jon Peatfield wrote:
> I just found a problem with the kernel-pll in 2.0.34pre10 (well it > hasn't changed since at least 2.0.33 as far as I can tell). It only > affects Alpha hardware (though it would affect anything which has > __KERNEL_HZ set to a value much larger than 100). > > On the alpha, asm-alpha/param.h defines __KERNEL_HZ to 1024 which is > fine, so tick being the number of uS between clock updates is > 977. (well it should be ~977.5 but...). > > However, which means that a single unit change in tick alters the > speed of the clock by 1024ppm. Again this isn't a real problem, but > linux/timex.h defines MAXFREQ as > > #define MAXFREQ (200L << SHIFT_USEC) /* max frequency error (ppm) */
Maybe the minimum should be dependent on HZ...
Patch proposals?
Regards, Ulrich
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