dmesg: Please enable the IOMMU option in the BIOS setup ?

[Tero Hiekkalinna]

Hello!

First of all, millions thanks to Dan Hensley helping me on "Losing some
ticks... checking if CPU frequency changed" problem! Updated kernel
fixed this.

I'm running FC4 (x86_64) on AMD Athlon 64 Dual Core 4800+ with 4GB of
RAM (ASUS A8N-SLI PREMIUM S939 NFORCE4, Kernel 2.6.14-1.1633_FC4smp) and
I have this on systems logs:

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Checking aperture...
CPU 0: aperture @ 8000000 size 32 MB
Aperture from northbridge cpu 0 too small (32 MB)
No AGP bridge found
Your BIOS doesn't leave a aperture memory hole
Please enable the IOMMU option in the BIOS setup
This costs you 64 MB of RAM
Mapping aperture over 65536 KB of RAM @ 8000000

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And also:

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PCI-DMA: More than 4GB of RAM and no IOMMU
PCI-DMA: 32bit PCI IO may malfunction.<6>PCI-DMA: Disabling IOMMU.

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I didn't find anything from bugzilla.kernel.org, but I found "old"
report bugzilla.redhat.org
(https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169115), but I
don't get kernel panic.

Should I be worried?

Thanks!

Best,
Tero