Date: Thu, 13 Apr 2006 10:42:49 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: sam@errno.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: <20060413.104249.18309735.imp@bsdimp.com> In-Reply-To: <443E7B68.50807@errno.com> References: <20060412212843.GH1258@haakonia.hitnet.RWTH-Aachen.DE> <20060412.160552.35796990.imp@bsdimp.com> <443E7B68.50807@errno.com>
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In message: <443E7B68.50807@errno.com>
Sam Leffler <sam@errno.com> writes:
: 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.
OK.
Warner
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