Re: Hyper-Threading Vulnerability

Arjan van de Ven
2005-05-14T18:01:47Z

On Sat, 2005-05-14 at 13:56 -0400, Lee Revell wrote:
> On Sat, 2005-05-14 at 18:44 +0200, Arjan van de Ven wrote:
> > then JACK is terminally broken if it doesn't have a fallback for non-
> > rdtsc cpus.
>
> It does have a fallback, but the selection is done at compile time. It
> uses rdtsc for all x86 CPUs except pre-i586 SMP systems.
>
> Maybe we should check at runtime,

it's probably a sign that JACK isn't used on SMP systems much, at least
not on the bigger systems (like IBM's x440's) where the tsc *will*
differ wildly between cpus...