Scheduler fixes for hyperthreading

Poul-Henning Kamp phk at phk.freebsd.dk
Sun May 22 01:32:06 PDT 2005


In message <1116729865.1917.92.camel at palm>, Stephan Uphoff writes:

>Would it be enough to disable access to RDTSC for user processes?
>I believe the attack needs a very exact time source.

You'd be surprised how much software breaks if you do that :-(

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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