Hello David,

The jbb and power results on Nehalem are as expected - more or less in line with official result using a similar software stack. But the HTN result is surprisingly low. Official results are in the 350-360k range on 3.33 GHz HTN, so your ~240k jbb number is strange. What exact configuration did you use for the HTN runs? Specifically; did you use the same JRockit version and did you disable HW prefetchers in the BIOS?

Some official jbb submissions with Nehalem have had the HW prefetchers off, some have not. I think there is a very slight benefit to turning them off but our results are not conclusive. Certainly nowhere near the huge benefit you could get from BIOS tuning on previous generation Intel chips.

Cheers,

Henrik