"f/f george" <george@yourplace.com> wrote in message
news:d85ci0dmcusn4p3l3tdh7r3id878jr3hjg@4ax.com...

On Fri, 20 Aug 2004 12:22:42 GMT, "Hurrah" <hurrah@not.here> wrote:

It was discussed eons ago here in the group, I did not have a dualie
then so didn't pay too much attention but....I seem to remember that a
processor that can be split into 2 processors like the Intel Hyper
Threading and the AMD Opterons use memory differently than when there
is no Opteron or HT available. The difference, I think,  is how the
processor locks memory to the cpu when you choose the affinity box.
They both lock memory but the AMD will only use that locked memory and
not go out to whatever is left over and will run out of available
memory to swap the processing into. The Intel seems to be able to do
that. Meaning that the AMD will lock say 512k of memory to the "real
side" Opteron and 512k to the "non-real" side of the chip. When Seti
then asks for more memory it cannot get it so the processing has to
swap to the hard drive making the crunching slower. Intel, I think,
handles this better and does not need to swap out so the affinity box
can be checked.

OK, I'll do a Google search on newsgroups and see what comes up.

H.