Re: [LAD] Timers, hpet, hrtimer -> kind of solved (for too old motherboards)

Ralf Mardorf wrote:
> Clemens Ladisch wrote:
>
>> "Busy" means that it's there, but already being used. Many motherboard
>> BIOSes do not initialize the third HPET interrupt, and the first two are
>> taken by the kernel.
>>
>
> I would like to make a test song using HR timer, but unfortunately I'm
> not able to close a project and open it again, even after doing a reset.
>
> Hem?
>
> From a mail I wrote yesterday to another list:
>
> "the good news is, that using HR timer will cause less jitter than the
> usage of any other timer.
> The bad news are
> - Open Octave will freeze the system when selecting HR timer
> - Qtractor is fine with HR timer, BUT only when I start a project. Once
> I closed it and try to load it again (even after doing a reset) I get
> this error:
>
> "This system has no accessible HPET device (Device or resource busy)"" [1]
>
Oops :)

pardon I need to correct this.

"I used
Qtractor 0.4.3.1418. For all timers I used kernel
2.6.29-1-multimedia-amd64 x86_64 and run jackd -Rdalsa -dhw:0 -r96000
-p512 -n2 -Xseq, but for HR timer only I used" ...

> "2.6.31.5-rt18 x86_64 and run jackd -Rch -dalsa -dhw:0 -r96000 -p512 -n2
> -Xseq. JACK is jackdmp 1.9.3. The self build kernel might be buggy." [1]
>
> " ||HR tmr|System|PCM pl|PCM ca
> ------++------+------+------+------
> 500.0|| 504.9| 505.6| 503.4| 503.2
> 1000.0||1005.4|1005.8|1005.3|1006.4
> 1500.0||1503.6|1506.4|1507.4|1507.3
> 2000.0||2003.8|2007.2|2007.9|2009.5
> 2500.0||2504.1|2504.3|2503.6|2503.2
> 3000.0||3006.0|3006.2|3005.9|3007.6
> 3500.0||3502.7|3505.4|3506.5|3509.5
> 4000.0||4003.1|4003.2|4008.8|4009.9
> msec +/- 0.1 msec
> maxDif|| 6.0| 7.2| 8.8| 9.9
> minDif|| -2.7| -3.2| -3.4| -3.2
> --------------+------+------+------
> Jitter|| 3.3| 4.0| 5.4| 6.7
> msec +/- 0.2 msec" [1]
>
> [1] http://lists.64studio.com/pipermail/64studio-users/2009-November/003885.html
>
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>

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