Date: Mon, 12 Jul 2010 15:57:29 +0200 From: Markus Gebert <markus.gebert@hostpoint.ch> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: 8.1-RC2 - PCI fatal error or MCE triggered by USB/ehci on Sun X4100M2? Message-ID: <0CF6CF2B-907C-42EF-B57E-DF50F0564455@hostpoint.ch> In-Reply-To: <201007120851.35529.jhb@freebsd.org> References: <6B57591F-9FA2-45EB-825F-1DB025C0635D@hostpoint.ch> <08562D52-02AA-46CF-BFCD-00D0A3C4DC34@hostpoint.ch> <FFB367B2-232D-460D-82B8-C3F03F1B53BE@hostpoint.ch> <201007120851.35529.jhb@freebsd.org>
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On 12.07.2010, at 14:51, John Baldwin wrote: >> Well, the situation has changed. Machine died over the weekend = running our=20 >> test load with above kernel configuration. It seems that not having = ehci in=20 >> the kernel at boot just makes the MCE much more unlikely to occur, = but it=20 >> occurs. With ehci, I can panic the machine within a minute, without = ehci it=20 >> seems to take at least hours. Still, I don't get why not having the = ehci=20 >> driver in the kernel should have any effect, especially because = nothing is=20 >> attached to it. >=20 > Ok, so maybe the SMI# interrupts do play a role somehow, at least as = far as=20 > altering the timing. Hm, if I've understood your other email correctly, disabling usb legacy = support should get rid of SMIs just as well as loading the ehci driver. = What I tested was kernel with ehci (panic within a minute) versus kernel = without ehci (panic within hours), but both cases with usb legacy = support disabled in BIOS. So, again, if I understand this correctly, the = "SMI rate" should have been the same in both cases, because usb legacy = support was turned off entirely, and therefore loading or not loading = ehci should not impact the SMI rate. If this should be the case, why = would there be an altering of timings between these two test cases? Since SMM is out the the OS' control, I guess there's no good way to = track SMIs? Markus=
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