Date: Mon, 20 Jun 2011 01:15:58 +0200 From: =?utf-8?B?RnLDqWTDqXJpYw==?= Perrin <fred@resel.fr> To: freebsd-questions@freebsd.org Cc: perryh@pluto.rain.com Subject: Re: Messages from MCA in the kernel log Message-ID: <kggpqm9s98x.fsf@pc-df-301.priv.enst-bretagne.fr> References: <kggtybnrrg2.fsf@pc-df-301.priv.enst-bretagne.fr> <4dfd100c.ZEvfAI/AN/67EPHi%perryh@pluto.rain.com>
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perryh@pluto.rain.com writes:
> 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.
Thanks for the pointers.
>> 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.
This server has been running since about 18 months, with a current
uptime of 75 days. This is the first time this message appeared, and has
not returned yet. I'll shrug it off as a one-time glitch.
Thanks for your comments. Have a nice day,
--
Frédéric Perrin -- http://tar-jx.bz
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