Re: [LAU] Ardour 2.1 Mixer Levelmeters acting very slow with acpi=off

hi everybody,
as an experiment on this item I compiled a kernel with modified config: I removed acpi completely and additionally deactivated the option "enable tickless..." (or so..).
Then I booted the kernel with standard options.
Result: Ardour behaves as it should, everything works just fine, system audio performance at it's best! Obviously there is a diffenrence between booting an acpi-enabled kernel with option "acpi=off" and a kernel built without acpi capabilities. Maybe somebody has an explanation - I don't...
thanks for attention anyway
Su

-------- Original-Nachricht --------
> Datum: Tue, 20 Nov 2007 10:57:58 +0100
> Von: Edgar Aichinger <edogawa@email-addr-hidden>
> An: linux-audio-user@email-addr-hidden
> Betreff: Re: [LAU] Ardour 2.1 Mixer Levelmeters acting very slow with acpi=off

> I can fully confirm now what Susanne described, on a desktop machine
> (32bit
> AthlonXP 2000+). I guess the freeze I was describing in my previous
> posting
> was unrelated, I could boot with acpi=off this time without problem.
>
> With acpi=off, I get significantly less xruns at a given frames setting.
> Clock source is tsc, and i don't see the "Clocksource tsc unstable
> (delta = xxx ns)" message at boot. Every meter in ardour (2.0-ongoing,
> checkout from yesterday, the new track header meters exhibit the same
> behaviour) shows extremely slow falloff, no matter what the corresponding
> option is set to.
>
> Am Montag, 19. November 2007 schrieb Susanne Schneider:
> > Thomas,
> > I do not get anything like:
> >
> > "Clocksource tsc unstable (delta = -107437170 ns)"
> > in dmesg...
> >
> > when booting with "acpi=off",
> > cat /sys/devises/..../current_clocksource returns: "tsc"
> >
> > when booting in regular mode (acpi enabled),
> > cat /sys/devises/..../current_clocksource returns: "acpi_pm"
> >
> > thanks and best regards
> > Susanne
> >
> >
> > Thomas Kuther schrieb:
> > > On Mo, 19.11.07 10:46 susemuse27@email-addr-hidden wrote:
> > >
> > >
> > >> hi,
> > >> I should have known this earlier: when starting my 2.6.24.rc2-rt1
> > >> with option "acpi=off" the audio performance increases significantly
> > >> and I could be happy - but - the levelmeters in Ardour's Mixer are
> > >> now acting strangely: They rise quickly but the falloff rate is at
> > >> lowest level and can't be adjusted. I've tried with a different
> > >> kernel, 2.6.23.1-rt11 - it's the same. Of course I can live with
> > >> that, it doesn't prevent me from enjoying my musical activity, but it
> > >> takes some patience... With acpi on action Ardour works fine. Did
> > >> anybody make similar experience and can give me a hint where to start
> > >> my investigations? thanks Susanne
> > >>
> > >> data:
> > >> Asus Laptop AMD Athlon 64
> > >> ATI-MobilityRadeon9700
> > >> openSuse 10.2-32Bit
> > >> USB-Lexicon Omega Studio
> > >> Ardour built with VST-support
> > >>
> > >>
> > >
> > > Hi Susanne,
> > >
> > > this sounds like a problem with the clocksource.
> > > That could be caused by powernow-k8 and cpufrequency scaling.
> > >
> > > I assume when the cpu is powered down right after startup, you see
> some
> > > messages in dmesg saying:
> > > ------
> > > Clocksource tsc unstable (delta = -107437170 ns)
> > > ------
> > >
> > > If so, you could try to disable cpu frequency scaling
> > > or make sure the system starts and runs with performance governor.
> > >
> > > cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> > > shows the currently used clocksource. Please post the output of that
> > > when booting with acpi=off and acpi enabled.
> > >
> > >
> > >
> > >
> ------------------------------------------------------------------------
> > >
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> > >
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> >
> >
>
>
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