On Thursday 31 January 2008 08:22:15 H. Peter Anvin wrote: > Yinghai Lu wrote: > > On Jan 30, 2008 10:09 PM, H. Peter Anvin <[EMAIL PROTECTED]> wrote: > >> Christoph Lameter wrote: > >>> x86 supports booting from a node without RAM? > > > > it is a two sockets system. only 4G RAM installed on node1. > > > > "Node 1" is the boot CPU, though, right? > > I don't know if the spec requires node 0 to be the boot node. Probably not.
There is no spec I know of that completely defines "nodes" on x86. Actually I think on Linux calls them that. There is the ACPI 3.0 SRAT spec that defines memory affinity, but I don't think it has any requirements about where the memory must be. Even if there was a spec people who actually put in DIMMs tend to violate it. It seems to be not totally uncommon to just stuff them all into the same corner of the motherboard to give a "tidy appearance" (for non physicists :-) and that usually results in memory less nodes. Anyways this area is something that regresses regularly. I had fixed it several times and tested all cases on SimNow, but after some time it tends to bit rot again unfortunately. The people who usually test kernels probably know where to put the DIMMs in. Probably just happened again. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
