Re: Missed jiffies

["H. Peter Anvin" <hpa@zytor.com>]

Pavel Machek wrote:

> Hi!
> 
> 
>>>lap tops), is the fact that TSC is NOT clocked at a fixed rate.  It is
>>>affected by throttling (reduced in 12.5% increments) and by power
>>>management.
>>>
>>If the TSC is affected by HLT, throttling, or C2 power management, the
>>TSC is broken (as it is on Cyrix chips, for example.)  The TSC usually
>>*is* affected by C3 power management, but the OS should be aware of
>>C3.
>>
> 
> Add thinkpad 560X (pentium/MMX) and toshiba 4030cdt (celeron) to your
> blacklist, then. I believe that by your definition *many* sstems are
> broken.
> 								Pavel


It's sad but true.  Unfortunately the TSC seems to be considered a
low-priority operation.  It's for systems like the above you need the
"no-tsc" option.

	-hpa