ACPI/power implementation causing performance loss with i7/Nehalem turbo boost

[Daniel O'Connor]

On Sat, 6 Mar 2010, Kevin Day wrote:
> So, it seems that the VMware hypervisor is deactivating cores on the
> CPU when idle, but FreeBSD itself isn't. Is anyone working on giving
> FreeBSD's idle loop/scheduler the ability to go into deeper sleep
> states? It seems this would have more than just a power savings
> benefit now.

What does "sysctl dev.cpu.0.cx_lowest" say?
And "sysctl dev.cpu.$N.cx_supported" ?

ISTR FreeBSD defaults to a very conservative setting here so you may 
have to set it manually.

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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