Kernel Benchmarks With P4+SMP+SMT?

[Justin Piszcz]

Has anyone performed any benchmarks with:

No SMP w/HT?
SMP w/HT?
SMP + SMT w/HT?

[ ] Symmetric multi-processing support
[ ]   SMT (Hyperthreading) scheduler support

  x SMT scheduler support improves the CPU scheduler's decision making
  x when dealing with Intel Pentium 4 chips with HyperThreading at a
  x cost of slightly increased overhead in some places. If unsure say
  x N here.

I'm tempted to try SMT and benchmark these sometime but I am asking the 
list if anyone has already done this first.

Question: "slightly increased overhead in some places."

What type of workloads would exhibit such overhead?

Would this option (SMT) be recommended for a desktop or server machine?

Are there any white papers or documentation I can read about this option?

Thanks.

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