Andi Kleen <ak@muc.de> wrote:
> There is nothing in any of my trees that generates such a message.
> If it was GART related it would be either "GART TLB error ..." or
> "extended error gart error". But even that should not happen anymore,
> see below.
>
> I don't know what the RedHat kernel does, they may have changed the
> MCE handler over the reference port.
>
A quick google brings up this reference:
http://www.iglu.org.il/lxr/source/arch/x86_64/kernel/bluesmoke.c
The error appears to be generated by the code starting around line 152
in that file.
Btw, what is 'bluesmoke'?
>> The system also has an Adaptec 2120S scsi raid card.
>
> Probably the driver is doing something bad with the pci_dma API
> (which uses the GART on x86-64)
>
Certainly I had a lot of trouble with this card, I was pleased the
aacraid driver worked enough to let me even install this time - the Red
Hat GinGin64 installer gave a kernel panic - so I wouldn't be surprised
if this card/driver were the cause. :(
> You can always disable it with mce=off or better mce=0
> as the message seems to be caused by the periodic non fatal MCE check
> timer.
>
What will I lose by disabling this?
I just tried booting with mce=0 and I am still getting the same errors.
> However there was a bug in the MCE handler where it managed to turn on
> an GART related MCE event through the backdoor that doesn't work
> correctly and is sometimes raised spuriously. But at least in the SuSE
> beta9 kernel or recent x86-64.org kernels this should have been
> fixed. But it doesn't generate such a error message anyways,
> so it's hard to know what the exact cause is.
>
> I would suggest to retry with a recent x86-64.org CVS kernel and see
> if it still happens there.
>
I will give that a go and see what happens.
Thanks for the response Andi.
-Simon
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