Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.

On Dec 1, 2006, at 10:56 AM, Alan wrote:

So I think people have blown those SSL timing attacks _way_ out of
proportion, just because it sounds technical and cool.

Besides, most of the time you can disable HT in the BIOS, which is better

anyway if you don't want it.

Agreed - but the SSL thing is an irrelevance. The main reason for
disabling HT (especially on a single core CPU) is because a lot of
workloads run faster with HT *off*.

Yes. Another way to effectively turn it off is to set maxcpus to the number of physical cpus in your system. So far I have not encountered a system that that approach does not work on.

--
Mark Rustad, [email protected]

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• References:
  • Ubuntu patch sync for 2.6.20
    • From: Ben Collins <[email protected]>
  • [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
    • From: Ben Collins <[email protected]>
  • Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
    • From: Pavel Machek <[email protected]>
  • Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
    • From: Ben Collins <[email protected]>
  • Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
    • From: Arjan van de Ven <[email protected]>
  • Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
    • From: Ben Collins <[email protected]>
  • Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
    • From: Arjan van de Ven <[email protected]>
  • Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
    • From: Linus Torvalds <[email protected]>
  • Re: [PATCH 1/4] [x86] Add command line option to enable/disable hyper-threading.
    • From: Alan <[email protected]>

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