Re: 2.6.24.4-64 x86_64 ... New IOMMU Error Message

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ke, 2008-04-02 kello 21:00 -0700, Sean Bruno kirjoitti:
> I seem to remember this error message a long time ago on my dual
> opteron, but then it went away.  Now it has reappeared with the latest
> kernel update:
> 
> Checking aperture...
> CPU 0: aperture @ c000000 size 32 MB
> Aperture 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 @ c000000
> Memory: 6129976k/7340032k available (2491k kernel code, 161028k
> reserved, 1390k data, 332k init)
> SLUB: Genslabs=12, HWalign=64, Order=0-1, MinObjects=4, CPUs=4, Nodes=2
> Calibrating delay using timer specific routine.. 4021.83 BogoMIPS
> (lpj=2010919)
> 
> 
> lspci output --> http://consultcsg.com/lspci.out
> full dmesg output --> http://consultcsg.com/dmesg.out
> 
A similar problem has been bothering my box since last August, see

https://bugzilla.redhat.com/show_bug.cgi?id=278721

However, when the box is rebooted (warm boot) the problem disappears and
the 128 M reserved for AGP aperture in BIOS is found and used. The
problem is there only if and when the box is cold-booted.
My box has an ATI Radeon 9200 PRO VGA compatible controller with nvidia
chipset. The motherboard (Asus K8N) BIOS has no IOMMU option.

HTH, Antti


> 

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