On Tue, Feb 07, 2006 at 10:06:46PM +0100, Florian Schmidt wrote: > > Hi all, > > > > Could a better graphics card result in better realtime performance? I can > > get a good realtime performance on my box (buffersize 64 and less) but > > when using X some display activity seems to cause xruns. E.g sooperlooper > > is far more usable without it's gui. > > > > This is on a pentium3 600Mhz PC, running gentoo kernel 2.6.14 with rt22 > > patch applied. I also prioritize the irq's as documented on this list. The > > graphics card is a Nvidia Vanta LT with 16 Mb memory. > > What software do you use? I assume JACK? If so, setting up the irq's is > not enough. You also need to run jackd with the right prio (below > soundcard irq, but above all others) > > See > > http://tapas.affenbande.org/?page_id=40 > > for a little more exhaustive info. Yes, i use jack. I also use the rtirq package. Here is the relevant info: reus ~ # cat /proc/interrupts CPU0 0: 1009634 XT-PIC [........N/ 0] pit 1: 727 XT-PIC [........./ 0] i8042 2: 0 XT-PIC [........N/ 0] cascade 4: 0 XT-PIC [........./ 0] Serial MIDI 5: 1661 XT-PIC [........./ 0] eth0 8: 2 XT-PIC [........./ 0] rtc 9: 1 XT-PIC [........./ 0] acpi, ICE1712 10: 121 XT-PIC [........./ 0] uhci_hcd:usb1, EMU10K1 12: 3651 XT-PIC [........./ 0] i8042 14: 4926 XT-PIC [........./ 0] ide0 15: 653 XT-PIC [........./ 0] ide1 reus ~ # /etc/init.d/rtirq status * status: started PID CLS RTPRIO NI PRI %CPU STAT COMMAND 200 FF 80 - 120 0.0 S< IRQ 8 14 FF 70 - 110 0.0 S< IRQ 9 262 FF 60 - 100 0.0 S< IRQ 10 277 FF 50 - 90 0.0 S< IRQ 1 206 FF 49 - 89 0.0 S< IRQ 12 209 FF 46 - 86 0.0 S< IRQ 6 240 FF 45 - 85 0.0 S< IRQ 14 242 FF 44 - 84 0.0 S< IRQ 15 6472 FF 41 - 81 0.0 S< IRQ 5 6635 FF 40 - 80 0.0 S< IRQ 4 Not exactly the same numbers as yours, but it looks ok to me. I was trying to avoid the route Lee mentions, debugging using the latency tracer, but it looks like i have to find some time to study it. Anyway, thanks a lot all of you for your input, i will let you know when i have made some progress. -- gerrit
