Spec wrote: > Seems that with RTIRQ another layer of virtual interrupts is created, > great, but.... I reckon it might be better to put sound card ahead of > hard disk which is still on physical irq 14/15 where agp is on 16, sound > card is on 17 and onboard is on 23. (That combined with another disk > software layer added with LVM (not that LVM hasnt got its advantages...) > in FC3 slowing it down) > > Anyone got any ideas how the set up of RTIRQ (if thats actually what is > doing it) virtual IRQ assignments is done? > > only running on an XP1600+, trying to squeeze a bit more out of it... > 48Khz low latency is pretty steady recording in ardour , but alsa_pcm > xruns at 96khz (happen about every 20 secs, seem to coincide with disk > access) particularly recording in ardour. Jack rack running multiple > effects at same 96khz 3.67ms latency is much more steady, roughly 1 > dropout every 10 minutes, and thats with me messing around in the > background in gnome browsing, writing this etc.. (but not doing much HD > access...) in fact it seems so consistent that it may be some process > every 9.x mins causing this. > > still thoroughly impressed though, 3ms latency stereo at 96kHz... > reliable enough to run jaaa .... and RT effects... Nice! > Are this about the rtirq (lowercase) script on planetccrma? I was the original author of those bits and it is intended to generically prioritize those IRQ thread handlers on a realtime-preemptible kernel (PREEMPT_RT). If this makes sense to you, just check the output of the command: /etc/init.d/rtirq status and see how IRQ 14 and IRQ 15 is going among the others. By default (see /etc/sysconfig/rtirq) the priority order is something like this, from highest to lower: rtc - real-time clock (usually IRQ 8) snd - ALSA PCI sound modules (usually IRQ 5, 17 and/or 22 ...) usb - USB host controllers (usually IRQ 10, 16, 18, 19 and/or 23 ...) i8042 - keyboard/ps2-mouse controllers (usually IRQ 1 and/or 12 ...) everything else must fall behind. The original rtirq micro-tarball is attached: (rtirq-20041118.tar.gz). You must have schedutils installed. If your system is not RPM based, so that you can't use the provided .spec file, you have to do the installation by hand, something in the likes of: cp rtirq.sh /etc/init.d/rtirq cp rtirq.conf /etc/sysconfig/rtirq Hope it helps. Cheers. -- rncbc aka Rui Nuno Capela rncbc@xxxxxxxxx -------------- next part -------------- A non-text attachment was scrubbed... Name: rtirq-20041118.tar.gz Type: application/x-tgz Size: 2538 bytes Desc: not available Url : http://music.columbia.edu/pipermail/linux-audio-user/attachments/20050304/990085a3/rtirq-20041118.tar-0001.bin
