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@xxxxxx> > An: linux-audio-user@xxxxxxxxxxxxxxxxxxxx > Betreff: Re: 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@xxxxxx 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. > > > > > > > > > > > > > ------------------------------------------------------------------------ > > > > > > _______________________________________________ > > > Linux-audio-user mailing list > > > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > > > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > > > > > _______________________________________________ > > Linux-audio-user mailing list > > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > > > > > > > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user -- GMX FreeMail: 1 GB Postfach, 5 E-Mail-Adressen, 10 Free SMS. Alle Infos und kostenlose Anmeldung: http://www.gmx.net/de/go/freemail _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
