Date: Fri, 10 Sep 2010 15:30:45 +0300 From: Andriy Gapon <avg@freebsd.org> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: freebsd-stable Stable <freebsd-stable@freebsd.org>, "John H. Baldwin" <jhb@freebsd.org> Subject: Re: Enabling MCA causes system hangs Message-ID: <4C8A24F5.7040100@freebsd.org> In-Reply-To: <4C89DE32.9050402@icyb.net.ua> References: <E0962551-398E-49C7-BFB6-496AB58B2779@gsoft.com.au> <4C89DE32.9050402@icyb.net.ua>
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on 10/09/2010 10:28 Andriy Gapon said the following: > on 10/09/2010 05:36 Daniel O'Connor said the following: >> Hi, I recently tried enabling MCA (ie w.mca.enabled=1 in loader.conf) on an >> 8.0-STABLE system and found that it would cause the system to hang after a >> few minutes of uptime. >> >> The screen would go black and the monitor would turn off (regardless of >> wether it was in X or not) and only a hard reset would bring it back. >> >> Also I found that quite often I had to power cycle the whole PC or the BIOS >> wouldn't detect the hard disks on boot(!) after a hang. >> >> uname is.. FreeBSD midget.dons.net.au 8.0-STABLE FreeBSD 8.0-STABLE #6 >> r202903M: Sun Jan 24 13:45:11 CST 2010 >> darius@midget.dons.net.au:/usr/obj/usr/src/sys/MIDGET amd64 Oh, I should have payed attention to the version. I think that this is a known and resolved problem. There is a hardware bug in AMD 10h processors that is triggered by combination of enabled MCA and FreeBSD superpages. So, you either have to disable one of them or upgrade to a more recent version. The version you need is r206183. The latest stable/8 would do, obviously. >> The motherboard is a Gigabyte GA-MA785GM-US2H with an Athlon II X2 240 CPU & >> 4Gb of RAM. > > Do you also have superpages enabled (vm.pmap.pg_ps_enabled)? > If so, please try to turn them off and report back if that helps. > -- Andriy Gapon
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