Messages in this thread | | | Date | Thu, 30 Nov 2006 11:06:11 +0000 | From | Alan <> | Subject | Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading. |
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On Wed, 29 Nov 2006 23:26:05 -0500 Ben Collins <bcollins@ubuntu.com> wrote:
> This patch adds a config option to allow disabling hyper-threading by > default, and a kernel command line option to changes this default at > boot time. > > Signed-off-by: Ben Collins <bcollins@ubuntu.com>
The description is wrong - this does not disable hyperthreading it merely leaves one thread idle. I don't believe Intel have ever published a procedure for truely disabling HT, but if you idle a thread you may want to adjust the cache settings on a PIV (10.5.6 in the intel docs) and set it to shared mode. Need to play more with what the bios does I guess.
So Ack but with the proviso it should say "Ignoring" or "Not using" not "Disabling", because it does not do the latter and there seem to be performance differences as a result
Acked-by: Alan Cox <alan@redhat.com>
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