Xeon 2.8GHz DP & 2.0GHz MP - Part I: Taking over the Enterprise

AnandTech Ad DB Performance 4X Load 8.4GB DB (Transactions per Second - Higher is Better) 4-way Intel Xeon MP 2.0GHz (Hyper-Threading) 4-way Intel Xeon MP 2.0GHz 2-way Intel Xeon DP 2.8GHz (Hyper-Threading) 2-way Intel Xeon MP 2.0GHz (Hyper-Threading) 2-way Intel Xeon DP 2.8GHz 2-way Intel Xeon MP 2.0GHz 2-way AMD Athlon MP 2200+ 2230.2 1754.1 1364.5 1352.8 1215.1 1115.4 982.8 | 0 | 446 | 892 | 1338 | 1784 | 2230 | 2676

Quadrupling the load sure does change things, doesn't it?

The biggest change is that Hyper-Threading now yields a performance gain across all platforms instead of selectively doing better on the Xeon DP setup. If we look at the performance gains: 27% on the 4-way Xeon MP, 21% on the 2-way Xeon MP and 12% on the 2-way Xeon DP it is clear that the Xeon MP setups benefit much more from HT than the Xeon DP. This is the exact opposite of what we saw going on in the original test but let's take a look at some more heavily loaded situations before determining why...