Date: Sat, 15 Nov 1997 15:23:09 +1100 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, mouth@ibm.net Cc: hackers@FreeBSD.ORG Subject: Re: Status of 650 UART support Message-ID: <199711150423.PAA28278@godzilla.zeta.org.au>
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>>>Edge triggered interrupts are not a factor. >> >>Yes they are. > >In what way? They force the interrupt handler to check all possible sources of the interrupt, although 90-99% of the times there will only be one interrupt source so returning after handling only one is best if checking the others is expensive (as it is for separate ISA devices). Bruce
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