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

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: > > >> 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

> 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. > > > >

_______________________________________________ Linux-audio-user mailing list Linux-audio-user(a)lists.linuxaudio.org http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user

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

just compiled 2.6.24-rc2-rt1 with dynamic ticks disabled and acpi enabled, booted with option "acpi=off" - Ardour works perfectly.

yes, hpet is enabled