On 03/01/2019 07:08 AM, Sami Jumppanen wrote:
Most of the time tempo is stable, but sometimes after being stopped for
a while, it may run overspeed right from the start and it takes some
time to slowly settle. CPU load in those cases has been really low.
That sounds like the same phenomenon. I'm on an older Core i5 with
vanilla Kubuntu 18.04.1. I'm using a Focusrite Scarlett 2i2. Nothing
in my BIOS has changed in several years. I think I turned CPU
throttling off, but if not, it was on five years ago too.
On 03/01/2019 09:44 AM, Ted Felix wrote:
> I've seen the occasional slow down at the beginning of playback,
but then things stabilize.
I'm seeing it speed up more often than slow down. Additionally, it
seems more likely to happen if Rosegarden has been open and idling for
some time. Quitting and restarting seems to buy enough time to get a
clean playback of a five minute file anyway.
> I'm guessing this is kernel/ALSA related. I run recent vanilla
> kernels, not the ones in the distro, so that may make me immune to this.
> I'll upgrade to the latest kernel and see if I can reproduce.
I'm running the stock distro "lowlatency SMP PREEMPT" kernel.
Also, yes, my source is up to date, and it's a debug build.
I verified that my timing source is set to "auto."
Come to think of it, I know there have been perennial problems with one
of the advanced timers that have caused endless mayhem. I ran lsmod and
I have snd_hrtimer loaded. I looked at the startup debug stream and see
that Rosegarden is picking "system timer." That sounds right. Vague
memory is that Chris would have preferred the HR timer, but it was
unstable, and given more recent discussion, it still is, so Rosegarden
defaults to something that usually works.
It usually does work, too. The most common timing-related user
complaint is playback just not running at all. That's the one scenario
where going in and trying random other timers until something works is
the stock solution. I can't remember the circumstances under which
people experience that, as I never have myself.
I wish time hadn't dulled my once sharp memory so much.
--
D. Michael McIntyre
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