Date: Fri, 09 Jan 2009 13:48:18 -0500 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: Zhang Weiwu <zhangweiwu@realss.com> Cc: freebsd-questions@FreeBSD.org Subject: Re: newbie: does irq setting in device.hints work? Message-ID: <44bpug2u4t.fsf@be-well.ilk.org> In-Reply-To: <4966D81B.8050107@realss.com> (Zhang Weiwu's message of "Fri\, 09 Jan 2009 12\:52\:43 %2B0800") References: <4966D81B.8050107@realss.com>
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Zhang Weiwu <zhangweiwu@realss.com> writes: > Hello. I come across device.hints manual which says I can set irq for > each device there. I am using 6.1. Kind of old now. I don't know specifically of any reason that would matter, but for several reasons I wouldn't be at all surprised. > The settings I made in devices.hints never worked. e.g. > > hint.uhci.0.at="pci" > hint.uhci.0.irq="12" > > I can set whatever value for irq and it always rebooted as irq 11. > > However 'disabled="1"' works. > > That's strange, I didn't find manual where it say it work in some > condition or for some device only. "Consult individual device drivers' manual pages for available keywords and their possible values." > Is there a way to assign uhci to use an irq differently? seems it is the > cause of an interrupt storm problem I am having. I'm not really sure if uhci is set up to do that. You definitely want uhci on its own interrupt if you can, not because it necessarily generates a lot of them, but because it can spend a lot of time handling each one... Have you checked what happens if you disable your APIC? -- Lowell Gilbert, embedded/networking software engineer, Boston area http://be-well.ilk.org/~lowell/
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