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

[Ralf Mardorf]

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
>
> _______________________________________________
> Linux-audio-dev mailing list
> Linux-audio-dev at lists.linuxaudio.org
> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
>
>   

-- 
Secret of Tux: http://images.wallaceandgromit.com/user_uploads/forum_thumbnails/5/75/355.jpg
"Gromit bit me" says HMV dog: http://img.dailymail.co.uk/i/pix/2007/03_03/GomitHMVPA_468x319.jpg