I was building a new kernel under FC2 this morning trying to make FC2 equal to my Gentoo kernel which is working very well. I made a mistake on this new kernel and forgot to turn on 'APIC contoller for UMP machines'. When the kernel booted I got all sorts of xruns. The IRQ was threaded, so I set it for non-threaded but still got a lot of xruns. (>100 in 10 minutes) I rebuilt the kernel where the only change I made was to enable APIC interrupts and IO-APIC controllers for UMP. The kernel booted and has been running for 30 minutes with no xruns... Just another IRQ datapoint, but that was the only change I made... - Mark
