Date: Tue, 06 Jun 2006 12:37:58 +0100 From: Pete French <petefrench@ticketswitch.com> To: jfvogel@gmail.com Cc: freebsd-stable@freebsd.org Subject: Re: Dual Opteron system will not run SMP Message-ID: <E1FnZsk-0007i7-DE@dilbert.firstcallgroup.co.uk> In-Reply-To: <2a41acea0606051012r5831971qb3d2fb88e701225@mail.gmail.com>
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> We (Intel networking group) have seen issues with SMP and amd64 > as well, although I dont know that its fully characterized (what works > and what doesnt) yet. When I tried mine under amd64 it seemed to behave slightly better oddly enough - it would at least boot up the SMP kernel without ACPI, though it would not recognise the second processor. The other difference when I was doing that test was that I was using an IDE drive though. I suppose I really need to put amd64 onto a normal disc drive and try booting that to narrow down which change made the difference there. > If just non-ACPI isnt sufficient, the other thing SAFE does is turn > off disk DMA. I have an as-yet unreleased system that has this > same type of issue, and the problem is that two PCI device ID's > are not recognized, so maybe that will be your problem. Interesting - I didn't realise you could do that with SCSI controllers. I had been wondering what 'safe' does differently, and whether I could fill up loader.conf with approrpiate values to emulate what 'safe' does and then start commenting them out one at a time. I'll do some more experiments and report back. I don't particularly mind if it doesn't work in the end (I'll just sell the pair of Opterons on ebay and buy a single faster one), but it's always good to try and track down a bug, so thanks for taking an interest. -pete.
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