FreeBSD performed poorly in comparison to Ubuntu when doing random writes, where the latencies were extremely high and off the charts compared to Mark Shuttleworth's operating system.
Ubuntu 9.10 remained with a much lower latency when performing threaded reads too, but here FreeBSD 8.0 RC1 had regressed compared to FreeBSD 7.2.
Well, more times than not, Ubuntu 9.10 Alpha 6 came out on top compared to FreeBSD -- both the 7.2 and 8.0-RC releases. Only in the 7-Zip, C-Ray, John The Ripper MD5, BYTE Unix Benchmark Dhrystone 2, and SQLite tests did FreeBSD outperform Ubuntu Linux. Between FreeBSD 7.2 and 8.0, the newer release generally did better but it had regressed with the 7-Zip, Gzip, MAFFT, and Threaded I/O Tester Read tests. That's how the story pans out on a dual AMD Opteron quad-core workstation, but shortly we will be back around with our large operating system comparison on different hardware and with the final releases of these different operating systems to see how they compare. You can run any of these tests for yourself (plus many others) using the Phoronix Test Suite.