On Fri, Feb 23, 2001 at 10:15:00PM +0100, wojtek@wojtek.from.pl wrote:
> > 
> > With IDE drives you've at last one interrupt per xfer. With a decent
> > SCSI adapter and driver you should be able to have serveral xfers per
> > interrupt. Also with today's IDE controllers you still have to read/write
> > registers on the PCI bus, before and after each xfer. This is slower than
> > main RAM, of course. With good SCSI controllers read/write of registers
> 
> yes - but this additional load isn't big unless you have one slow CPU and
> 20 IDE drives. 

It's significant for a busy server - especially if it also has to deal with
network interrupts.

--
Manuel Bouyer <bouyer@antioche.eu.org>
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