[LAU] Worse performance in 3.4.x kernel over 2.6.33?

Hi, I've been seeing noticeably worse performance using 3.4.5 and 3.4.11 PlanetCCRMA fc17 kernels over my old 2.6.33 PlanetCCRMA kernel, and I was wondering if anyone else has experienced this. Running seven instances of OP-X under WINE, for example, consumed about 10% more CPU. I also whipped out LatencyTOP to take some readings, and I see that poll_schedule_timeout and pipe_wait seem to be culprits. What is interesting is that the maximum milliseconds reading is staying roughly the same for poll_schedule_timeout, yet the percentage increases as much as 4x or more. I take this to mean that although the worst-case is about the same between the new kernel and the old, that on average it's waiting on this function longer. I'm also running with a USB audio device, in case that might make a difference. The realtime priorities, in general, look sane. Any advice would be very much appreciated! -Louis