Messages in this thread | | | From | Jacob Martin <> | Subject | Re: PROBLEM: OOPSes in PREEMPT SMP for AMD Opteron Dual-Core with Memhole Mapping (non tainted kernel) | Date | Wed, 15 Jun 2005 20:46:37 +0000 |
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On Wednesday 15 June 2005 03:51 pm, you wrote: > On Mon, Jun 13, 2005 at 07:53:16PM +0000, Jacob Martin wrote: > > On Monday 13 June 2005 10:06 am, Andi Kleen wrote: > > > On Sun, Jun 12, 2005 at 03:29:50PM -0400, Jacob Martin wrote: > > > > Hardware memhole mapping never seems to work, or causes lockups right > > > > away. I need to test it further though. > > > > > > > > I have discovered that with the following features enabled: > > > > > > > > 1. Software memhole mapping > > > > 2. Continuous, > > > > > > > > linux sees the entire 4GB of memory. However, when things start > > > > getting requested from the upper half, there are Oopses generated. > > > > Attached are two Oopses that occurred under the test scenario > > > > described. > > > > > > What happens when you boot with numa=off or with numa=noacpi ? > > > > You got it! It seems to be working just fine without it compiled into > > the kernel. > > Not compiled what in the kernel? I just wanted you to boot > the kernel with these options.
I took NUMA support out of the kernel. I will recompile NUMA in and reboot with the options. I'm very stable now without NUMA in the kernel.
> > > The system seems to believe it has memory in an area not covered > > > by mem_map. > > > > I think you hit it right on the head. > > > > I enabled NUMA because I had anticipated upgrading later. So I guess if > > you don't actually have NUMA set up hardware-wise, and enable this > > module, then you will have problems. > > No, it should work fine in theory.
Hmm, ok I'll work with you to try and verify that what happened really happened because of NUMA.
> > Maybe a simple update to the kernel "K8 NUMA support" Processor feature's > > help section should be made to note this? Or, is there something that > > could be fixed somewhere. I wouldn't mind helping, it was baffling me > > for two weeks. > > It is something that must be either fixed or workarounded (if it's a bug > in your BIOS, which is quite possible) > > Can you send me the full dmesg from a numa boot again?
Yes, I'll send it to you as soon as this experiment I am running finishes (unless you know how to sleep a process to disk for reenactment after boot?). > -Andi > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Jacob Martin - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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