[Bloat] Hardware upticks

[Steinar H. Gunderson]

On Tue, Jan 05, 2016 at 10:57:13AM -0800, Dave Täht wrote:
> Context switch time is probably one of the biggest hidden nightmares in
> modern OOO cpu architectures - they only go fast in a straight line. I'd
> love to see a 1ghz processor that could context switch in 5 cycles.

It's called hyperthreading? ;-)

Anyway, the biggest cost of a context switch isn't necessarily the time used
to set up registers and such. It's increased L1 pressure; your CPU is now
running different code and looking at (largely) different data.

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