Carsten Langgaard wrote:

"Gleb O. Raiko" wrote:

quoted

Basically, requirement of uncached run makes hadrware logic much simpler
and allows  to save silicon a bit.

That could be true, but then again I suggest making specific cache routines for those
CPUs.
It would be a real performance hit for the rest of us, if we have to operate from
uncached space.

In theory, yes, there is a performance penalty. In practice, I doubt
this penalty is significant. Sure, Linux likes to flush cahces, not to
say more. But, did somebody measure the penalty of uncached runs? Even
with microbencnmarks like lmbench.

Regards,
Gleb.