Nick Piggin has been doing some benchmarking of recent linux kernels and FreeBSD 7.0 on a 2xquad core barcelona opteron. He verified that the CFS problems seem to be fixed and FreeBSD's performance on this box with mysql is really very similar up to about 20 threads. I feel confident that the test was conducted fairly and I'm happy with these results. Our stable release is doing very well even if fresh-out-of-git linux is showing better on this platform. We already have some good gains in this workload in 8.0-CURRENT as well. What's most important to me is that we stay relevant on common server hardware and we're doing a good job at that.
I'm also happy to see some collaboration and competition between linux and bsd kernel developers. I hope that continues. We're really more alike than we are different.
Next up, we now have a 16 way xeon and 16 way opteron system to tune and test with. More points of contention are being removed. The code marches on.