Date: Thu, 13 Apr 2006 09:25:12 -0700 From: Sam Leffler <sam@errno.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org, brueffer@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/pccbb pccbb.c Message-ID: <443E7B68.50807@errno.com> In-Reply-To: <20060412.160552.35796990.imp@bsdimp.com> References: <200603300425.k2U4PjJH099559@repoman.freebsd.org> <20060412212843.GH1258@haakonia.hitnet.RWTH-Aachen.DE> <20060412.160552.35796990.imp@bsdimp.com>
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M. Warner Losh wrote: > In message: <20060412212843.GH1258@haakonia.hitnet.RWTH-Aachen.DE> > Christian Brueffer <brueffer@FreeBSD.org> writes: > : On Thu, Mar 30, 2006 at 04:25:45AM +0000, Warner Losh wrote: > : > imp 2006-03-30 04:25:45 UTC > : > > : > FreeBSD src repository > : > > : > Modified files: > : > sys/dev/pccbb pccbb.c > : > Log: > : > On some laptops, under very high loads, the socket event register read > : > in the ISR doesn't read the actual socket event register, but instead > : > reads garbage (usually 0xffffffff, but other times other things). > : > This totally violates the PCI spec, but happens rarely enough that a > : > workaround is in order. This adds one test when we have a real > : > interrupt to service (which is very rare), and doesn't affect the > : > usualy 'nothing to see here' case at all. > : > > : > Problem reported by many, but sam@ gave me this workaround after > : > diagnosing the problem. > : > > : > : This breaks pccard/cardbus support on my Thinkpad T41p (confirmed by > : backing this change out). With this change, I just get an "Interrupt > : storm detected on irq 5; throttling" message. > : > : What kind of debug info can I provide? > > A Thinkpad T41p. :-) > > Failing that, can you set hw.cbb.debug=1 and provide me with the > output. We should just back this out until we can resolve the issue. For other folks: the change was originally done for an hp nx6125 laptop where running a wireless card in monitor mode would cause spontaneous interface detach's under load. It sounds like the root cause is elsewhere. Samhelp
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