Robin Gareus wrote:
> On 07/15/2010 01:07 PM, Ralf Mardorf wrote:
>> On Thu, 2010-07-15 at 12:55 +0200, Clemens Ladisch wrote:
>>> Ralf Mardorf wrote:
>>>> dev.hpet.max-user-freq
>>>
>>> This parameter will not have any effect on anything because there is no
>>> program that uses the HPET timers from userspace.
>
> That'd be correct if Ralf would stick to 'amidiplay' and friends for his
> tests.
>
> There are a couple of audio-tools who can use either RTC or HPET for
> timing, although most of them need an option to explicitly enable it.
Jack can read the current time from /dev/hpet, but it does not use it to
generate interrupts. As far as I know, there is no program that does.
> BTW. Do you know the unit of these values?
> cat /sys/class/rtc/rtc0/max_user_freq
> cat /proc/sys/dev/hpet/max-user-freq
> are they Hz?
Yes.
>> IIRC someone on jack-devel mailing list had issues when using mplayer
>> with the value 64 and it was solved when using the value 1024.
This has nothing to do with MIDI timing; mplayer can use the RTC (not
HPET) for audio/video synchronization to work around the 100 Hz limit of
the system timer on old Linux kernels.
Regards,
Clemens
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Received on Fri Jul 16 20:15:26 2010
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