12806 Serial console polling burns CPU on VMware

Review Request #2568 — Created May 29, 2020 and updated — Latest diff uploaded

gwr
illumos-gate
12806
general

12806 Serial console polling burns CPU on VMware

Setup illumos guest under VMware with serial console
Notes here: https://github.com/jclulow/vmware-sercons
Booted with the change
press Esc to stop at loader prompt
observe laptop fan quiet

Boot the kernel with -kd
while stopped at kmdb prompt
observe laptop fan quiet

During later operation, break into kmdb (telnet send brk, or mdb -K)
observe laptop fan quiet

I did not observe any other behavior changes with this code.

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