Messages in this thread |  | | Date | Thu, 22 Aug 2002 15:06:11 +0100 (BST) | From | Hugh Dickins <> | Subject | Re: Hyperthreading |
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On Thu, 22 Aug 2002, Marc Dietrich wrote: > On Wed, 21 Aug 2002, Hugh Dickins wrote: > > > > You do need CONFIG_SMP and a processor capable of HyperThreading, > > i.e. Pentium 4 XEON; but CONFIG_MPENTIUM4 is not necessary for HT, > > just appropriate to that processor in other ways. > > I used KNOPPIX on a 2 way Dell WS 530 (Xeon 2.0 GHz). This distribution has > CONFIG_M386 set (as most others also?) and HT was not enabled. I compiled the > kernel myself (same config as KNOPPIX but with CONFIG_MPENTIUM4) and HT gets > enabled. So is _does_ matter for which processor the kernel is optimized.
I'm surprised - perhaps the Knoppix distribution did not have SMP enabled itself, but installed a config with CONFIG_SMP? Or you built more recent kernel sources (2.4.19 defaults to HT on) than the Knoppix distribution (vanilla 2.4.18 defaults to HT off)?
It would be awkward for me to try CONFIG_M386 on our P4 Xeon, but I did just try building a CONFIG_M586 CONFIG_SMP kernel for it, which behaved as I expected: /proc/cpuinfo showed 4 cpus, but only 2 cpus when booted with "noht".
Hugh
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