Am Samstag 06 Juni 2009 schrieb Volker Armin Hemmann: > *sigh* Ok, just for starters - all AMD cpus of the Athlon64 architecture > have a builtin agpgart. This agpgart functions also as an iommu. This is > a great hack to have a hardware iommu . Intel does not have this, so they > rely on software. The solution came up while AMD devs and linux kernel > devs worked together. > Please read the following links: > > http://en.wikipedia.org/wiki/Iommu > > http://marc.info/?l=linux-kernel&m=107759901509280&w=2 > > http://marc.info/?l=linux-kernel&m=107764033904042&w=2 > > the iommu is needed so 32bit pci devices can live with their pci adress > space behind 4gb and other sweet things. > > Sadly the iommu needs a minimum on memory for itself - and uses the agp- > aperture. This is fine, but mobo vendors suck and make it too small/or > not available. In that case the kernel is forced to use real memory for > the iommu. > > In short, that message has nothing to do with your problem. > Thanks for these informative links
> The NR_CPU message is confusing - I strongly suspect that your kernel > config is really fucked uo. ?? As I have a DualCore-Cpu, I changed NR_CPU to 2, something wrong with that? What else can be fucked up? I Enabled Multi-core scheduler (hyperthread is disabled) > > Please enable: > > [] Check for low memory corruption > [] Reserve low 64K of RAM on AMI/Phoenix BIOSen > > in the kernel config. Also clean it up and remove stuff like > 'hyperthreading scheduler'. > Already done. > If the problem persists, start testing your hardware. > How? I don't have access to special test equipment to test hardware. This is the only AM2(+) board and the only AM2 CPU I have. The RAM is also unique to this machine. > I would suspect the PSU. The Powersupply? What makes you think that the PSU can be the cause of a system crash? Greetings Alex