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