The results:
music@devuan:~$ uname -a
Linux devuan 6.1.0-3-rt-amd64 #1 SMP PREEMPT_RT Debian 6.1.8-1 (2023-01-29)
x86_64 GNU/Linux
music@devuan:~$ grep -i preempt_voluntary /boot/config-$(uname -r)
# CONFIG_PREEMPT_VOLUNTARY is not set
music@devuan:~$ grep -i preempt_dynamic /boot/config-$(uname -
Thanks, Will. Here's a slightly newer set of steps based on what
I've learned this morning...
Boot into your real-time kernel.
Confirm that it is a preemptible kernel.
$ grep -i config_preempt= /boot/config-$(uname -r)
CONFIG_PREEMPT=y
If you don't see "CONFIG_PREE
Kernel in a Nutshell answers my question about preempt voluntary in
chapter 11:
--
PREEMPT_VOLUNTARY
Voluntary kernel preemption (desktop)
This option reduces the latency of the kernel by adding more “explicit
preemption points” to the kernel code. These new preemption p
/etc/default/grub either needs to *not* mention preempt (default is
full) or have preempt=full. If you aren't experiencing any timing
glitches then you should be ok.
Ted.
On 2/19/23 8:53 PM, chuck elliot wrote:
I haven't noticed any problems but the current standard kernel in
Fedora 36 ha
I'll try this today.
On Sun, 19 Feb 2023 12:19:53 -0500
Ted Felix wrote:
> Will, can you go through this first draft series of steps on the
>problematic box and let me know if it finds the issue? Thanks.
>
>Boot into the problematic kernel.
>
>Confirm that it is a preemptible kernel.
>
>
I haven't noticed any problems but the current standard kernel in
Fedora 36 has:
CONFIG_PREEMPT_DYNAMIC=y
CONFIG_PREEMPT_VOLUNTARY=y
in /boot/config-$(uname -r)
does this need to be overridden in /etc/default/grub or in a kernel
rebuild ?
On 19/02/2023 5:19 pm, Ted Felix wrote:
Will, can
Will, can you go through this first draft series of steps on the
problematic box and let me know if it finds the issue? Thanks.
Boot into the problematic kernel.
Confirm that it is a preemptible kernel.
$ grep -i config_preempt= /boot/config-$(uname -r)
CONFIG_PREEMPT=y
If you don'
On second thought... We've been here before. From my Linux MIDI Guide:
Note: There are variations on PREEMPT that are less than ideal.
"DYNAMIC_PREEMPT" allows PREEMPT to be turned on and off in the kernel
command line options (preempt=full). You'll need to check your GRUB
configu
Hello,
> the
ALSA documentation is incomplete and in many cases incorrect
Do you happen to remember off hand which parts are incorrect? I think we
should report them to the ALSA project.
- PM
On Sun, 19 Feb 2023, 13:53 Ted Felix, wrote:
>We rely completely on ALSA for timer stuff. The ke
We rely completely on ALSA for timer stuff. The key routine for
setting the timer in RG is:
AlsaDriver::setCurrentTimer()
Unless there is a bug in there (which there may very well be, the
ALSA documentation is incomplete and in many cases incorrect), the
problems tend to be due to bugs i
Recently I found Rosegarden was losing the timer source, and the transport was
freezing - sometimes for nearly a second after which it would send a bunch of
notes, then carry on as normal.
It was some time before I realised it only happened on my Ryzen 5 machine (the
one I use for music) and not o
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