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 _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/listinfo/linux-audio-dev
