Debian 7.0 vs. FreeBSD 8.2, both using gcc 4.6 on my Phenom II x6 1090T @ 3.2
GHz

FreeBSD 8.2, gcc 4.6, -march=barcelona

Render Time:
  Photon Time:      0 hours  0 minutes  2 seconds (2.390 seconds)
              using 9 thread(s) with 2.763 CPU-seconds total
  Radiosity Time:   No radiosity
  Trace Time:       0 hours  3 minutes 10 seconds (190.466 seconds)
              using 6 thread(s) with 1113.568 CPU-seconds total

Debian 7.0, gcc 4.6.1, -march=barcelona

Render Time:
  Photon Time:      0 hours  0 minutes  2 seconds (2.277 seconds)
              using 9 thread(s) with 2.648 CPU-seconds total
  Radiosity Time:   No radiosity
  Trace Time:       0 hours  3 minutes 38 seconds (218.326 seconds)
              using 6 thread(s) with 1277.363 CPU-seconds total

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