From owner-freebsd-questions@FreeBSD.ORG Sun Jun 19 23:16:08 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8B41E1065670 for ; Sun, 19 Jun 2011 23:16:08 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from lo.gmane.org (lo.gmane.org [80.91.229.12]) by mx1.freebsd.org (Postfix) with ESMTP id 458968FC0A for ; Sun, 19 Jun 2011 23:16:07 +0000 (UTC) Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1QYRDq-0005Hl-9J for freebsd-questions@freebsd.org; Mon, 20 Jun 2011 01:16:06 +0200 Received: from pool-116.enst-bretagne.fr ([192.108.117.68]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 20 Jun 2011 01:16:06 +0200 Received: from fred by pool-116.enst-bretagne.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 20 Jun 2011 01:16:06 +0200 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-questions@freebsd.org From: =?utf-8?B?RnLDqWTDqXJpYw==?= Perrin Date: Mon, 20 Jun 2011 01:15:58 +0200 Lines: 29 Message-ID: References: <4dfd100c.ZEvfAI/AN/67EPHi%perryh@pluto.rain.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: pool-116.enst-bretagne.fr User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) Cancel-Lock: sha1:Z3gAOtyv0pNImqKWZOB97t6DFII= Cc: perryh@pluto.rain.com Subject: Re: Messages from MCA in the kernel log X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Jun 2011 23:16:08 -0000 perryh@pluto.rain.com writes: > Frederic Perrin 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