20 Nov
2007
20 Nov
'07
5:58 a.m.
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(a)gmx.de wrote:
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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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