The Fujitsu guys have a nice summary of this:
http://www.labs.fujitsu.com/en/techinfo/linux/lse-0211/index.html
Skip forward to page 8.
Dont blame the networking code just yet :) Notice how worse UP vs SMP
performance is on the P4 compared to the P3?
This brings up another point, is a single CPU with hyperthreading worth
it? As Rusty will tell you, you need to compare it with a UP kernel
since it avoids all the locking overhead. I suspect for a lot of cases
HT will be a loss (imagine your case, comparing UP and one CPU HT)
Anton
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