QoSPacket sched. clock source & CPU cycle counter &

[mbar]

Hi.
I recently made a patch to powernow-k7.c kernel module and frequency scaling on my Mobile Barton finally works. I use 'conservative' cpufreq governor and I made it use frequency range form 600 MHz to 2200 MHz in 10 steps.
I also use QoS options, but now when I create my qdiscs (tested and working on my earlier kernel without powernow scaling) it simply slows down every transfer to a grind (100-600 bytes/s). Earlier (when my processor worked only at peak frequency, 2.2 GHz) it worked with my defined rates etc.
So my question is: can 'CPU cycle counter' be used as a clock source? I know that readme in kernel says 'but on some architectures it (...) doesn't handle cpu clock frequency changes' and I wonder if x86 is one of them. Do I have to revert to 'timer interrupt'?