Date: Mon, 16 Aug 93 10:04:21 -0400
From: DJ Delorie <dj AT ctron DOT com>
To: eyal AT fir DOT canberra DOT edu DOT au
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: SVGA page fault: what is the overhead?


> Anyone knows the total page fault machine cycles overhead (this should
> include fault+extender time+griver time+iret time.

two task switches	~400-600 cycles
resetting old pages	8 ands * 3 banks plus logic
setting new pages	8 ands * 3 banks plus logic
programming I/O		unknown

The task switches are the big hit, but they are required for the
general page fault handler.