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> >>> Marek Marczykowski-Górecki 31.08.2021, 02:52 >>>
On Fri, Sep 03, 2021 at 10:28:35PM +0200, Ulrich Windl wrote:
> Can't it be disabled via kernel (grub) command line, too?
This is exactly "the second method" above.
> Also rumours say you can even disable it at runtime (and the threads will be
> migrated to other threads before).
> Occasionally some tools seem to have problems with HT being disabled (like
> "expecting 8 CPUS, but only found 4").
This is kind of similar issue as the one discussed here. That's why it's
better to disable HT in BIOS - to not show those 8 CPUs at all. But from
the OS level, we don't have other choice, and we prefer a secure
default - that's why we disable HT at Xen level, to provide safer option
regardless of what user has set in the BIOS.
PS Please don't top-post. And keep the mailing list in CC.
Invisible Things Lab
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