Messages in this thread | | | Subject | Re: Dual Core Opteron hangs, iommu Entries (x86_64) | From | Andi Kleen <> | Date | 19 Sep 2006 09:09:26 +0200 |
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Jon Mason <jdmason@kudzu.us> writes: > > Your problem is that you have more than 4GB of RAM and not enough room > in your IOMMU aperature to handle all of the pending DMA requests. > Dmesg suggests you go into your BIOS and increase your AGP aperature > from 32M to 64M, did you try that?
The kernel ignores 32MB apertures anyways and creates its own 64MB aperture.
Normally IOMMU overflow should be handled without a hang though, assuming you don't have a buggy driver. If you don't trust it you can boot with iommu=panic panic=30 -- then the kernel will always panic and reboot when this happens. The aperture can be also increased with iommu=memaper=3 or 4
But it could be a lot of other things. So far you don't seem to have any evidence that it's the IOMMU except for some likely misguided googling.
The usual way to check for unknown hangs is to just configure serial console and see if there is some output during the hang.
Also do a memtest86 for at least 12hours.
-Andi
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