[ltp] HPET timer on thinkpads?

[Clark Williams]

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Henrique de Moraes Holschuh wrote:
> On Tue, 23 Oct 2007, Igor V. Rafienko wrote:
>> on Oct 23, 2007, 07:37, Nils wrote:
>>>> that draws about 1.3W *more* than 2.6.22 without the hpet-patches. Does 
>>>> anyone else experience that?
>>> Yes, I've the same problem with the T41p and 2.6.23.1-hrt3. (I thought it 
>>> was a problem with slub or slab allocator, but the power consumption is 
>>> the same with both allocators.)
>> Hmm... this cannot possibly be the intention of the patch.
> 
> Test pure 2.6.23.1 first.  Or don't, 2.6.23 has some bad problems in ACPI,
> that are probably going to get fixed in 2.6.23.2.
> 
> But -hrt is NOT about power consumption control, it is about real-time
> behaviour.
> 

Not strictly true. The -hrt patch is mostly about improving timer granularity above
the standard system clock tick. In addition the NO_HZ mechanism really is targeted at
reducing power consumption, by reducing the number of interrupts the system has to
service when in idle state.

The -rt patch (which includes the -hrt patch) is about real-time behavior.

Clark
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