Date: Sat, 18 Jun 2011 13:52:28 -0700 From: perryh@pluto.rain.com To: fred@resel.fr Cc: freebsd-questions@freebsd.org Subject: Re: Messages from MCA in the kernel log Message-ID: <4dfd100c.ZEvfAI/AN/67EPHi%perryh@pluto.rain.com> In-Reply-To: <kggtybnrrg2.fsf@pc-df-301.priv.enst-bretagne.fr> References: <kggtybnrrg2.fsf@pc-df-301.priv.enst-bretagne.fr>
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Frederic Perrin <fred@resel.fr> wrote:
> ... I don't know what MCA, DRD, SNOOP and {D,G}CACHE stand for...
MCA = Machine Check Architecture.
DRD here probably refers to a data read cycle.
SNOOP has to do with hardware-maintained cache coherency.
DCACHE = data cache.
Google and/or Wikipedia may help with the details.
> Is it a transient error?
I _think_ the COR refers to a corrected error, but that could be
either transient (a random bit-flip, possibly due to a cosmic
ray hit) or permanent (a bit in the cache has gone bad). In the
latter case I'd expect ongoing error messages, rather than just
two isolated occurrences.
> Should I start screaming at my hosting provider so he changes my
> CPU?
I would say not, unless the errors become frequent or uncorrectable.
> +MCA: Bank 0, Status 0xcc00000120040189
> +MCA: Global Cap 0x0000000000180204, Status 0x0000000000000000
> +MCA: Vendor "GenuineIntel", ID 0xf49, APIC ID 0
> +MCA: CPU 0 COR OVER GCACHE L1 SNOOP error
> +MCA: Address 0x1015b00
> +MCA: Misc 0x140002d800aa0
> +MCA: Bank 1, Status 0x8000002000000135
> +MCA: Global Cap 0x0000000000180204, Status 0x0000000000000000
> +MCA: Vendor "GenuineIntel", ID 0xf49, APIC ID 0
> +MCA: CPU 0 COR DCACHE L1 DRD error
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