Ping-pong on Hyperthread CPUs?

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I have noticed that processes tend to ping-ping between the two
virtual CPUs in my Hyperthreaded P4 machine (kernel 2.4.20). I know
this would be bad on true SMP systems, but does it have any impact
with Hyperthread CPUs? Should I be worried?

Also, hardware interrupts all seem to be going to the first virtual
CPU. I assume this is intentional.

Thanks,
Dan
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