Date: Thu, 05 Dec 1996 16:13:14 -0700 From: Steve Passe <smp@csn.net> To: vanmaren@fast.cs.utah.edu (Kevin Van Maren) Cc: smp@freebsd.org Subject: Re: make locking more generic? Message-ID: <199612052313.QAA15542@clem.systemsix.com> In-Reply-To: Your message of "Thu, 05 Dec 1996 15:47:26 MST." <199612052247.PAA29804@fast.cs.utah.edu>
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Hi, > We still have the problem with two (say, adaptec SCSI) devices > on different IRQs vs two different devices on the same IRQ. > > This is why multiple I/O APICS would be great -- each device > gets it own unique IRQ. Then the OS can play games redirecting > IRQs for processor affinity interrupt handling, better load > (IRQ) ballancing, etc. multiple controllers can use unique PCI IRQs, IF the manufacturer designs the motherboard correctly, all on 1 IO APIC. Or the MB manufacturer can ignore those extra IRQs on the IO APIC and "redirect" PCI IRQs to traditional ISA IRQs. doing the kernel to account for all these "design considerations" that the various boards throw our way make it even more challenging! -- Steve Passe | powered by smp@csn.net | FreeBSD
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