I can tell you that the Pentium D CPUs work fine with CentOS 3 and
kernel 2.4.21-32.0.1.ELsmp. Presumably the newer kernels
incorporate more support for these CPUs, possibly activating
additional features not supported by earlier kernels. But they
work fine with the older kernels.
Bug 147823, <https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=147823>,
seems to describe the problem -- basically, there are/were issues
with hyperthreading and dual-core processors where the machine
would run slowly when hyperthreading was on. With hyperthreading
off, the machine acted like it had two ``real'' processors and
worked fine. There's supposed to be a fix in RHEL3 U6 (and
presumably there's a similar bug for RHEL4 and an update for RHEL4
U2).
Claire
--
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Claire Connelly cmc@xxxxxxxxxxxx
Systems Administrator (909) 621-8754
Department of Mathematics Harvey Mudd College
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