[LAU] 1. Linux-Rt and TSC - 2. Linux-Rt and IRQ allocation

Hi, there are 2 things I don't understand. 1. Linux-Rt and TSC =================== All Rt kernels for all Linux distros I use seem to have an issue regarding to TSC. I wonder what to do, to get rid of those messages, IOW how to fix the issue. E.g. Debian 32-bit architecture root@debi386:/mnt/arch/home/rocketmouse/Desktop# dmesg | grep TSC [ 0.000000] Fast TSC calibration using PIT [ 0.000000] Marking TSC unstable due to TSCs unsynchronized root@debi386:/mnt/arch/home/rocketmouse/Desktop# grep TSC /var/log/messages Jan 16 09:28:08 debi386 kernel: [ 0.000000] tsc: Fast TSC calibration using PIT Jan 16 09:28:08 debi386 kernel: [ 0.000000] tsc: Marking TSC unstable due to TSCs unsynchronized Jan 16 09:28:08 debi386 kernel: [ 0.003000] calibrate_delay_direct() ignoring timer_rate as we had a TSC wrap around start=4287833042 >=post_end=13864416 Jan 16 09:50:58 debi386 kernel: [ 0.000000] tsc: Fast TSC calibration using PIT Jan 16 09:50:58 debi386 kernel: [ 0.000000] tsc: Marking TSC unstable due to TSCs unsynchronized Jan 22 12:05:33 debi386 kernel: [ 0.000000] Fast TSC calibration using PIT Jan 22 12:05:33 debi386 kernel: [ 0.000000] Marking TSC unstable due to TSCs unsynchronized Jan 22 are messages when booted to kernel 3.2.0-4-rt-686-pae i686 from the repositories. Jan 16 might be a broken kernel 3.8.13-rt14-pae-rocketmouse I build based on a 3.8.13-rt14 x86_64 config. E.g. Arch Linux 64-bit architecture On startup I see "x86 Rt requires FEATURE_CONSTANT_TSC" or similar for Arch Linux Rt kernels from the repositories and for the once I build. This link for Chromebooks was the best explanation I found: http://www.chromium.org/chromium-os/how-tos-and-troubleshooting/tsc-resynch… root@debi386:/mnt/arch/home/rocketmouse/Desktop# grep tsc /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy 3dnowprefetch lbrv flags : [snip] tsc [snip] 2. Linux-Rt and IRQ allocation ============================== All kernels I used in the last years for *buntu, Debian and Arch Linux <= 3.8.13-rt14 (kernels > 3.8.13-rt14 don't work on my machine) give my graphics it's own IRQ, the Debian kernel 3.2.0-4-rt-686-pae doesn't. What options do I need to enable, so that it will allocate the graphics it's own IRQ too, instead of sharing it with the RME card? Regards, Ralf