Re: Hyper-Threading Vulnerability

On Sat, 2005-05-14 at 19:40 -0400, Lee Revell wrote:
> > it's a matter of time (my estimate is a year or two) before processors
> > get variable frequencies based on temperature targets etc...
> > and then rdtsc is really useless for this kind of thing..
> 
> I was under the impression that P4 and later processors do not vary the
> TSC rate when doing frequency scaling.  This is mentioned in the
> documentation for the high res timers patch.

seems not the case, and worse, during idle time the clock is allowed to
stop entirely.... (and that is also happening more and more and linux is
getting more agressive idle support (eg no timer tick and such patches)
which will trigger bios thresholds for this even more too.



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: Hyper-Threading Vulnerability
    • From: Alan Cox <[email protected]>

• References:
  • Hyper-Threading Vulnerability
    • From: Gabor MICSKO <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Andi Kleen <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: "Richard F. Rebel" <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Andi Kleen <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Andy Isaacson <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Matt Mackall <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Alan Cox <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Lee Revell <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Dave Jones <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Lee Revell <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Alan Cox <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Lee Revell <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Arjan van de Ven <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Lee Revell <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Arjan van de Ven <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Lee Revell <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Arjan van de Ven <[email protected]>
  • Re: Hyper-Threading Vulnerability
    • From: Lee Revell <[email protected]>

• Prev by Date: Re: Automatic .config generation
• Next by Date: Re: Automatic .config generation
• Previous by thread: Re: Hyper-Threading Vulnerability
• Next by thread: Re: Hyper-Threading Vulnerability
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]