Howdy,
When I started up rosegarden4 (v. 1.2.3) that comes with Mandriva
2007.0 I got a warning about my system timer resolution being
too low. I posted a question about this to the rosegarden-user
mailing list and got this in reply:
Since 2.6.x the Linux kernel has been shipping with
the default timer resolution set too [coarse] for MIDI
purposes. This changed somewhere after 2.6.9, and the default
went from 1000 Hz to 250 Hz. Everybody across the spectrum of
distros is getting hit with this annoying problem.
If your kernel is otherwise working, and if you can get a
copy of its source and its config, all you have to do is
change one configuration option and rebuild. The option is
under Processor Type and Frequency -> System Timer, and you
want to pick 1000 HZ, save the config, rebuild, and so forth.
Another person on the list replied:
One gets this same message on a vanilla OpenSuSE 10.2 machine
(Rosegarden was unable to find a high-resolution timing
source for MIDI performance...) You need to recompile your
kernel with the system timer frequency parameter changed from
the default 250 Hz to 1000Hz. There is a how-to here for
SuSE, which may be helpful:
http://wiki.jacklab.net/index.php/Rosegarden_system_timer_resolution
I know how to build and install kernels. But, when I do that then a
number of things break because the kernel source name and module names
of the subsequent kernel don't seem to match well enough for dkms (or
whatever) to find the right stuff to load my proprietary video driver.
On Mandrake 10.1 I lived without video hardware acceleration whenever I
wanted to use my pro-audio applications. Yuck.
Is there any real-time way to change the timer resolution?
Should I be submitting this in Mandriva's bugzilla? I would think
that this change might be easily bundled into the next kernel
security release. Your thoughts?
Thanks....
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