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DateMon, 20 Aug 2007 12:23:07 +0200
FromAndi Kleen <>
SubjectRe: Non atomic unaligned writes
> Intel486???, Pentium??, or P6 family processors. The P6 family processors
> provide bus control signals that permit external memory subsystems to
> make split accesses atomic; however, nonaligned data accesses will

Normally in standard SMP systems between CPUs they are atomic AFAIK 
(modulo bugs) 

You're right -- i'm not sure about P5 SMP.

> seriously impact the performance of the processor and should be avoided
> where possible.

But they're also slow yes.

-Andi
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