Well. No change in Jack behavior with LXDE, no change from total removal of Pulse. Now I really wonder. 64-bit has definitely upped my GUI speed, often tripled my WWW speed -- but it has either not touched audio (synth and Jack) performance and latency, or has hurt it slightly! Anyone seen the same thing? J.E.B. >>> Should CONFIG_HPET_EMULATE_RTC be set to n on a realtime kernel? Is >>> there something else which might invalidate CONFIG_HPET=y ? >>> >>> >> the RTC device is unrelated to HPET. your kernel can have HPET support >> but if your h/w doesn't, you don't get /dev/hpet. My motherboard, for >> example, does not have an HPET device. >> >> > That is interesting. I am interested principally because I'm seeing > xruns and am hunting for causes, and that stood out. > > Checked the BIOS; HPET is there, already turned on. Running the > vanilla-install Debian Testing (AMD64) kernel, package > "linux-image-2.6.30-2-amd64" version 2.6.30-8, I do have a /dev/hpet. > Running any of six or seven slightly different but very clean rtlinux > builds (vanilla kernel source of 2.6.31.6, plus rtlinux > patch-2.6.31.6-rt19.bz2), .config options verified and reverified very > carefully, I don't have a /dev/hpet. Anything I should check? Do you > think I should get on a kernel dev list? > > But I understand now that hpet may have little or nothing to do with the > xrun problem. At least part of the symptomatology, is that Pulse > talking to Jack on 64-bit Debian Testing / Gnome with GUI sound events > off, seems to eat a whole lot more of Jack's DSP capacity than the same > combination on 32-bit / LXDE. On 32-bit, Pulse at idle ate zero CPU; > now on 64-bit, Pulse at idle is eating about 2%. I'm wondering right > this minute if Gnome keeps its default sound open, delivering full-bore > (albeit silent) audio even when it's told not to do so. > > I suppose I'll try LXDE. But any suggestions will be very much appreciated. > > J.E.B. > > _______________________________________________ > 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
