Re: Hyper-Threading Vulnerability

Andi Kleen
2005-05-15T10:01:55Z

On Sat, May 14, 2005 at 08:01:33PM +0200, Arjan van de Ven wrote:
> 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...

It does not even need SMP, just use a Centrino laptop.

I suppose what the Jack guys are doing is to recommend to disable
frequency scaling then the sound guys complain again
that sound on linux is so hard to use. I wonder where this comes from? :)

-Andi