When the da(4) driver does a dump, it uses the CAM transport layer's polled
completion/action facility, xpt_polled_action().
It looks like there is a substantial delay (1ms) in that routine between
That would still allow 4MB/sec (1 page per I/O) - I think there's more to
it than just that.
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the taks and relationships force
people to take different points of view. [Dr. Fritz Todt]
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