Re: [CentOS] intel dual core processors and new kernel packages - Discuss

5 Oct 2005


      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@math.hmc.edu 
  Systems Administrator                          (909) 621-8754   
  Department of Mathematics                 Harvey Mudd College
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