Re: [LAU] Trying to get rid of xruns

Quoth Matthew Smith at 2008-07-31 11:43... <snip/> <snip/> Many thanks to those who responded on this issue - suggestions have been taken on board and this is where we are now. Having enquired of the linux-rt-users list, I was advised to use 2.6.24.7-rt17, being the "latest and greatest". It appears that my issue with 2.6.25.8-rt7 is a know issue and that there are patches available. So, I duly built the recommended kernel and the errors in dmesg have gone away. I have looked at my /proc/interrupts and can't see any obvious conflicts. However, I am now getting an almost constant stream of xruns - far worse than when I was using a standard kernel. I tried disconnecting all my external USB devices but the xruns continued to show up in a never-ending stream. Looking at the output of top and ps, there seem to be a lot of kernel processes that weren't there before which makes me wonder if I haven't stuffed up the configuration of the RT kernel. (I was having to guess at the configuration values that were unfamiliar to me.) For completeness, I should probably state that my fglrx (video) driver no longer shows up in /proc/interrupts - the driver is incompatible with RT kernels so I simply didn't install it. (The driver is a closed-source one [with no available open source alternative] and the installation process tells me to go away because it doesn't like RT or low-latency kernels.) My X session looks fine without it, so I question exactly what good it was doing... Here's my /proc/interrupts: CPU0 CPU1 0: 104035013 12175 IO-APIC-edge timer 1: 18 0 IO-APIC-edge i8042 8: 1 0 IO-APIC-edge rtc 9: 96344 17 IO-APIC-fasteoi acpi 12: 4280 0 IO-APIC-edge i8042 14: 37 0 IO-APIC-edge ide0 16: 146819 160 IO-APIC-fasteoi ahci, uhci_hcd:usb2, eth0 17: 82562 0 IO-APIC-fasteoi uhci_hcd:usb3, HDA Intel 18: 26 0 IO-APIC-fasteoi uhci_hcd:usb4 19: 81102 265 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb5 NMI: 0 0 Non-maskable interrupts LOC: 33916179 83674441 Local timer interrupts RES: 37665467 38976190 Rescheduling interrupts CAL: 40 35 function call interrupts TLB: 247574 257703 TLB shootdowns TRM: 0 0 Thermal event interrupts THR: 0 0 Threshold APIC interrupts SPU: 0 0 Spurious interrupts ERR: 0 I've posted the relevant kernel .config here: <http://www.smiffysplace.com/files/kconfig_rt_20080803> 1) Does anyone have any idea what's going wrong? 2) Does anyone have a .config for a 2.6.24 kernel with the RT patch that is working well with Jack that they would be willing to share? I guess that starting from a known-good configuration would be my next logical step unless anyone can just spot the error. Cheers M -- Matthew Smith Smiffytech - Technology Consulting & Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy