Date: Wed, 25 Jan 2006 09:16:57 -0500 From: John Baldwin <jhb@freebsd.org> To: Craig Boston <craig@tobuj.gank.org> Cc: freebsd-hackers@freebsd.org, Scott Long <scottl@samsco.org> Subject: Re: Weird PCI interrupt delivery problem (resolution, sort of) Message-ID: <200601250916.59336.jhb@freebsd.org> In-Reply-To: <20060125003405.GA29970@nowhere> References: <20060120014307.GA3118@nowhere> <200601241043.51094.jhb@freebsd.org> <20060125003405.GA29970@nowhere>
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On Tuesday 24 January 2006 19:34, Craig Boston wrote: > On Tue, Jan 24, 2006 at 10:43:49AM -0500, John Baldwin wrote: > > What if you do a read of the lapic before the write? Maybe doing 'x = > > lapic->eoi; lapic->eoi = 0;'? > > Reading the lapic before the write has no effect. > > Reading the lapic after the write makes it work. Hmm, perhaps the read forces the write to post? Scott? -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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