ixl 40G bad performance?

[Ian Smith]

On Mon, 19 Oct 2015 21:47:36 -0700, Kevin Oberman wrote:
 > > I suspect it might not touch the c states, but better check. The safest is
 > > disable them in the bios.
 > >
 > 
 > To disable C-States:
 > sysctl dev.cpu.0.cx_lowest=C1

Actually, you want to set hw.acpi.cpu.cx_lowest=C1 instead.  Otherwise 
you've only changed cpu.0; if you try it you should see that other CPUs 
will have retained their previous C-state setting - up to 9.3 at least.

Setting performance_cx_lowest=C1 in rc.conf (and economy_cx_lowest=C1 on 
laptops) performs that by setting hw.acpi.cpu.cx_lowest on boot (and on 
every change to/from battery power) in power_profile via devd notifies.

cheers, Ian