System resolution timer too low

zuvuya wrote:

> When I try to start the Rosegarden4 MIDI sequencer it trows up a box
> that says my system timer resolution is too low and that Rosegarden was
> unable to find a high-resolution timing source for MIDI performance."
>
> Can anyone please point me in a direction to find out about tuning the
> kernel for higher timing performance?
>
> Thanks.


I just chanced to look over here at the moment and saw your post + a few
replies.....

Just so happens that I am dealing with this very issue right now. Have a
look at the following url. After trying to launch JACD in a terminal I saw
an error message about time_slice somethin-or-rather' and decided to go to
the JACK web site. Then I did a Google search and found the previously
alluded to web page here:

http://wiki.jacklab.net/index.php/3_Steps_to_JAD_for_Beginners

I've added the jarpack repo and I'm going to install the real time kernel.
I hope everythin goes well and I'll let you know soon......if my computer
doesn't blow up..... LOL

Go ahead and check out that link for now. You may want to wait a bit to see
how it works out for me.

P.S. Is that smoke I see or am I just sweating bullets ?

P.S. #2 I've installed a real time kernel in the past for a different
reason and I seem to recall having succeeded. But then my recollections
aren't always right.......as he downloads kernel source

zuvuya wrote:
> When I try to start the Rosegarden4 MIDI sequencer it trows up a box
> that says my system timer resolution is too low and that Rosegarden was
> unable to find a high-resolution timing source for MIDI performance."
>
> Can anyone please point me in a direction to find out about tuning the
> kernel for higher timing performance?


From my rc.local:
# Fixing RTC
/bin/echo Setting RTC Max-User-Freq to 1024
/usr/bin/logger -i -t rc.local "Setting RTC Max-User-Freq to 1024"
/bin/echo 1024 > /proc/sys/dev/rtc/max-user-freq

HTH
--
Lew Pitcher

Master Codewright & JOAT-in-training | Registered Linux User #112576
http://pitcher.digitalfreehold.ca/ | GPG public key available by request
---------- Slackware - Because I know what I'm doing. ------

Rajko M. wrote:
> zuvuya wrote:
>
>> When I try to start the Rosegarden4 MIDI sequencer it trows up a box
>> that says my system timer resolution is too low and that Rosegarden was
>> unable to find a high-resolution timing source for MIDI performance."
>>
>> Can anyone please point me in a direction to find out about tuning the
>> kernel for higher timing performance?
>>
>> Thanks.
>
> It will work anyway and I wasn't able to say that I can hear distortions.
>
> The SUSE/openSUSE kernel is compiled with system clock resolution of 250 Hz
> which is good optimum for desktops and servers.

It's not a good "optimum" for desktop and servers. 1000Hz is a good
optimum for desktops. 250Hz is a compromise by SUSE in order not to
have to provide two different kernels (one for servers, one for
desktops), so they chose 250 to "cover both". Though I would imagine
that people running servers would know how to compile their own kernel
SUSE should have chosen 1000Hz.

Michael Soibelman wrote:

> zuvuya wrote:
>
>> When I try to start the Rosegarden4 MIDI sequencer it trows up a box
>> that says my system timer resolution is too low and that Rosegarden was
>> unable to find a high-resolution timing source for MIDI performance."
>>
>> Can anyone please point me in a direction to find out about tuning the
>> kernel for higher timing performance?
>>
>> Thanks.
>
>
> I just chanced to look over here at the moment and saw your post + a few
> replies.....
>
> Just so happens that I am dealing with this very issue right now. Have a
> look at the following url. After trying to launch JACD in a terminal I
> saw an error message about time_slice somethin-or-rather' and decided to
> go to
> the JACK web site. Then I did a Google search and found the previously
> alluded to web page here:
>
> http://wiki.jacklab.net/index.php/3_Steps_to_JAD_for_Beginners
>
> I've added the *jarpack repo and I'm going to install the real time
^(should have said jacklab !)

------------------------------snip---------------------------------

--------------------------------snip------------------------------------
>>
>> http://wiki.jacklab.net/index.php/3_Steps_to_JAD_for_Beginners
>>
>> I've added the *jarpack repo and I'm going to install the real time
> ^(should have said jacklab !)
>
> ------------------------------snip---------------------------------

Well I've rebooted and am now running the (rt) new kernel. Still not able
to start jack but I'll keep trying, reading, looking, hacking, etc...

Fortunately I ran 'mkinitrd' before rebooting and I still have my previous
kernel on the Grub menu so no harm done. It's getting late and I've been
having lots' of fun so maybe I'll get it (jack) running today, If
not..tomorrow..tomorrow....

P.S. To the OP it is the jack server that needs to run for Rosegarden to
work as you requested. I'm not absolutely certain, from what I've read
today, that you have to have the real time kernel but it probably doesn't
hurt...

I'll let the group now if/when I get jack/rosegarden fully functional.