Date: Sat, 25 Dec 2010 16:27:37 +0300 From: Sergey Kandaurov <pluknet@gmail.com> To: Carl Johnson <carlj@peak.org> Cc: freebsd-stable@freebsd.org Subject: Re: MCA messages after upgrade to 8.2-BEAT1 Message-ID: <AANLkTin_77Y=hYDVq7UYqGAq=FwwWFKqVZt6O%2BKKU2Tp@mail.gmail.com> In-Reply-To: <87r5d6e9vb.fsf@oak.localnet> References: <4D11F1F5.7050902@quip.cz> <201012220957.26854.jhb@freebsd.org> <4D13A579.8090004@langille.org> <AANLkTi=yWh5_0anXyYs4u9KiKpZnC%2BqW%2BAG8YF1Ogbt2@mail.gmail.com> <87vd2iepkv.fsf@oak.localnet> <AANLkTin_2PsAL-N3Sct-S9Do7qCnR6-Dubwt1GOKgD-r@mail.gmail.com> <87r5d6e9vb.fsf@oak.localnet>
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On 25 December 2010 07:48, Carl Johnson <carlj@peak.org> wrote: > Alan Cox <alan.l.cox@gmail.com> writes: > >> On Fri, Dec 24, 2010 at 5:08 PM, Carl Johnson <carlj@peak.org> wrote: >> >>> Alan Cox <alan.l.cox@gmail.com> writes: >>> >>> > 2010/12/23 Dan Langille <dan@langille.org> >>> > >>> >> On 12/22/2010 9:57 AM, John Baldwin wrote: >>> >> >>> >>> On Wednesday, December 22, 2010 7:41:25 am Miroslav Lachman wrote: >>> >>> >>> >>>> Dec 21 12:42:26 kavkaz kernel: MCA: Bank 0, Status 0xd40e400000000= 833 >>> >>>> Dec 21 12:42:26 kavkaz kernel: MCA: Global Cap 0x0000000000000105, >>> >>>> Status 0x0000000000000000 >>> >>>> Dec 21 12:42:26 kavkaz kernel: MCA: Vendor "AuthenticAMD", ID 0x40= f33, >>> >>>> APIC ID 0 >>> >>>> Dec 21 12:42:26 kavkaz kernel: MCA: CPU 0 COR OVER BUSLG Source DR= D >>> >>>> Memory >>> >>>> Dec 21 12:42:26 kavkaz kernel: MCA: Address 0x236493c0 >>> >>>> >>> >>> >>> >>> You are getting corrected ECC errors in your RAM. =A0You see them o= nce an >>> >>> hour >>> >>> because we poll the machine check registers once an hour. =A0If thi= s >>> happens >>> >>> constantly you might have a DIMM that is dying? >>> >>> >>> >> >>> >> John: >>> >> >>> >> I take it these ECC errors *may* have been happening for some time. = What >>> >> has changed is the OS now polls for the errors and reports them. >>> >> >>> >> >>> > Yes, we enabled MCA by default in 8.1-RELEASE. >>> >>> Is there some reason that it is only available for i386 and not for >>> amd64? =A0Linux has something called mcelog, for machine check errors, >>> which sounds similar and is available for amd64. >>> >>> >> Perhaps I'm misunderstanding your question, but our MCA driver is suppor= ted >> and enabled by default on both i386 and amd64. > > Thanks, it appears that I misunderstood. =A0I ran whereis and found > /usr/src/sbin/mca and didn't find it on my amd64 system. =A0I do see it i= n > my sysctl listing now that I look there. > I guess that's designed for ia64 only (at least there's no hw.mca.first on other arches). --=20 wbr, pluknet
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