Date: Thu, 11 Sep 1997 21:31:14 +0200 From: Mats Lofkvist <mal@algonet.se> To: current@FreeBSD.ORG Subject: Re: lousy disk perf. under cpu load (was IDE vs SCSI) Message-ID: <199709111931.VAA01882@kairos>
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The interrupt sharing of the ncr and ahc controllers indeed seemed
to be the problem. With the ncr driver removed from the kernel, the ahc
worked ok and now I'm running with them both but on separate interrupts
and the bogus behaviour is gone. Convincing the Providence motherboard
to use different irqs wasn't easy, I finally tricked it by telling it
irq 10 (which it used to use for fxp0, ncr0 and ahc0) was needed for
an isa card which made it use irq 9 for fxp0 and ncr0 and irq14 for ahc0.
Conclusion: 2.2.2R doesn't like to have an ncr and an ahc on the same
interrupt.
Thanks for the help I got from all of you!
_
Mats Lofkvist
mal@algonet.se
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