K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2016-03-18T19:48:49.553615Z
K 7
svn:log
V 552
Check IPI status more frequently when waiting.

An IPI cannot be sent via the local APIC if a previous IPI is still
being delivered.  Attempts to send an IPI will wait for a pending IPI
to clear.  Prior to r278325 these checks used a spin loop with a
hardcoded maximum count which broke AP startup on some systems.
However, r278325 also enforced a minimum latency of 5 microseconds if an
IPI was still pending which resulted in a measurable performance hit.
This change reduces that minimum latency to 1 microsecond.

Tested by:	stas
MFC after:	3 days

END