HyberThreading

Brian Beardall brian at rapsure.net
Thu Aug 31 14:54:54 MDT 2006


On Thu, 2006-08-31 at 12:35 -0600, Andrew Jorgensen wrote:
> On 8/31/06, Nicholas Leippe <nick at leippe.com> wrote:
> > On Thursday 31 August 2006 11:33, Adam Fisher wrote:
> > > I was told that HyberThreading and Linux Kernels don't go well together.
> > >
> > >
> > > True or False?
> >
> > False.  Unless you have some very specific qualifier for 'go well together'.
> 
> The important question is if it's still true.  Some serious security
> flaws were discovered and the short-term fix was to disable HT.  Some
> distros disabled it for you in a security update.  Does anyone know if
> a permanent fix was found?
> 
> - Andrew
There was/is a security bug, but it also affected/affects Windows. It's
a hardware bug in the way Intel implemented Hyperthreading. The Linux
devs did a workaround to keep threads from different programs from
spying on other threads.

Brian Beardall




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