Not noticed that, and I can't see why it should be the case in general,
though I suppose some machines might be odd. Got any numbers?
just the fact that the system boot memory test takes 3-4 times as long with 8G or ram then with 4G of ram. I then boot a 64 bit kernel on the system and never use PAE mode again :-)
if you can point me at a utility that will test the speed of the memory in different chunks I'll do some testing on the Opteron systems I have available. unfortunantly I don't have any Xeon systems to test this on.
Mmm. 64-bit uniproc systems, with > 4GB of RAM, running a 32 bit kernel
don't really strike me as a huge market segment ;-)
true, but there are a lot of 32-bit uniproc systems sold by Intel that have (or can have) more then 4G of ram. These are the machines I was thinking of.
Does your opteron box have more than 1 socket? that'd explain it.
Anyway, it shouldn't happen on any normal platform. Until we get
numbers that prove that it does (and understand why), I don't think
we need NUMA for PAE.