MTRRs must always be set properly, and they need to be consistent among the CPUs (and E820 info). For HT, they are shared between the two logical processors in a processor package. So you just set them once per processor package. Wrong MTTR setups (e.g. set UC for WB) can easily cause performance problems.
Jun
> -----Original Message-----
> From: Reed, Timothy A [mailto:timothy.a.reed@lmco.com]
> Sent: Tuesday, March 04, 2003 3:37 AM
> To: Linux Kernel ML (E-mail)
> Subject: MTRR & HT
>
> Morning all,
>
> Quick question about MTRR and Hyper-Threading, should I be using
> MTRR in conjuction with HT? Are there any performance reasons to use or
> not
> use MTRR with HT?
>
> TIA
> Timothy Reed
> Software Engineer \ Systems Administrator
> Lockheed Martin - NE & SS Syracuse
> Email: timothy.a.reed@lmco.com
>
> There are 10 types of people in the world; those who understand binary and
> those who don't
>
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