How is hyperthreading handled on amd64?
petefrench at ticketswitch.com
Mon Mar 13 15:16:17 UTC 2006
> I don't see this behaviour on i386 - my desktop, for example uses only
> CPU 0 if the sysctl is 0, and switches between 0 and 1 when the sysctl
> is 1.
Uh, a typo on my part - substitute *machine* for *kernel*. Sorry!
A machine with one physical processor works fine - ccan enable and disable
hyperthreading as pper the manual. A machine with two physical processors
always gets hyperthreading enabled though. All of these machines are
running 6.0 currently - though I will verify that the bug is still there
on 6.1 when I get a moment to do an update on them.
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