Re: 21.12 "Cloud Nine" segfaults on Sue-Leap-15.4

On 5/16/23 7:09 PM, [email protected] wrote:
> # uname -a
> Linux localhost.localdomain 6.2.10-1-default #1 SMP PREEMPT_DYNAMIC Thu Apr  6 10:36:55 UTC 2023 (ba7816e) x86_64 x86_64 x86_64 GNU/Linux

   This is the first time I've seen PREEMPT_DYNAMIC.  That is workable 
so long as preempt is enabled in grub.  To check:

   $ grep -i preempt /etc/default/grub

You should either see nothing or "preempt=full" along with possibly 
other options.

> # grep ^CONFIG_HZ /boot/config-`uname -r`
> CONFIG_HZ_250=y
> CONFIG_HZ=250
> 
> So does this mean that I do have a low-latency but not real-time kernel?

   Low-latency (so long as it is configured properly via grub) and a 
low-resolution timer which can lead to timing problems for music. 
Overall, I would characterize this as a partially real-time kernel.

   Might be worth digging around in OpenSUSE to see what other kernel 
packages there are.  Looks like there may be no official kernel-rt 
package anymore, but maybe a community package?

   https://software.opensuse.org/package/kernel-rt

> The issue raised is encountered in Suse-Leap.
> Rosegarden ran fine before so I presume all the
> configs WERE correct at one time, but usually
> after a number of upgrades the segfaults begin,
> there is no crash, just no takeoff even.

   Ok.  This is odd.  Usually things become *more* stable over time.  Or 
at least stay the same.

> Thanks for the ref, the second half is way over
> my head but I'll keep it for re-reading.

   Yeah, it's pretty heavy stuff.  And again, it oftentimes leads to the 
discovery that "not much can be done".

Ted.