On Sat, Sep 26, 2009 at 01:29:53PM +0200, Ralf Mardorf wrote: > Arnout Engelen wrote: >> - increased the rtprio for the USB IRQ handler > > How can I do this? I only know how to make my Siwssonic USB MIDI device > head of the USB devices by Rui's rtirq. > > Is there something I could change for rtirq, to get less jitter for the > USB MIDI device?
I haven't looked into rtirq yet (I really should), but if I understand correctly rtirq does automatically what I did manually: find out which IRQ the device you're interested in is connected to, and give that IRQ a higher rtprio. To see the current rtprio's of your IRQ's, do: ps axHo user,lwp,pid,rtprio,ni,command | grep irq To increase the rtprio of some irq manually: chrt -f -p <prio> <pid> >> - decreased the 'latency_timer' value for my wireless network card and >> cardbus >> slot >> - tried to increase 'latency_timer' for the USB controller, but it >> remained at 0 - i guess it doesn't support this option > > *?* http://irc.esben-stien.name/mediawiki/index.php/Setting_Up_Real_Time_Operation_on_GNU/Linux_Systems#PCI Arnout _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
