Messages in this thread |  | | From | Marc Dietrich <> | Subject | Re: Hyperthreading | Date | Thu, 22 Aug 2002 16:36:54 +0200 |
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Am Donnerstag, 22. August 2002 :06 schrieben Sie: > 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)?
I don't think so. Original kernel gives me 2 penguins and cpuinfo shows 2 cpu's. Kernel is 2.4.19 with xfs patches and there is no "noht" option. I attached a dmesg file of this one. Btw, setting the processor also sets some other options (CMPXCHG, TCS, PGE, ...).
> 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".
Give it a try. A dual Xeon won't take to much time to compile a new kernel ;)
Greetings
Marc
-- Marc Dietrich
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