x86-64 box

Franco Saliola saliola-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org
Thu Jun 23 03:51:03 UTC 2005


On 6/12/05, Christopher Browne <cbbrowne-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:

> 1.  It is highly debatable whether or not hyperthreading provides
> *any* improvement.

Especially since hyperthreading isn't implemented correctly!

"Hyper-Threading, as currently implemented on Intel Pentium Extreme
Edition, Pentium 4, Mobile Pentium 4, and Xeon processors, suffers
from a serious security flaw. This flaw permits local information
disclosure, including allowing an unprivileged user to steal an RSA
private key being used on the same machine. Administrators of
multi-user systems are strongly advised to take action to disable
Hyper-Threading immediately; single-user systems (i.e., desktop
computers) are not affected."
    http://www.daemonology.net/hyperthreading-considered-harmful
 
Franco

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