FreeBSD, Centos and ZFS - SOLVED

Charles Swiger cswiger at
Wed Oct 23 01:04:21 UTC 2013


On Oct 22, 2013, at 4:40 PM, aurfalien <aurfalien at> wrote:
> OMG, what a relief... the ~30% diff in performance was due to a BIOS setting, in particular this one;
> Intel Turbo Boost Technology

This is Intel's automatic overclocking, which mainly ups the speed on multicore CPUs
if some of the cores are idle leaving thermal headroom.  You usually want this on for
best performance.

> Enhanced Intel SpeedStep Tech

This is dynamic power management involving lower clock frequencies and usually voltages;
it reduces power consumption, but can also reduce performance for some workloads
if not properly tuned.  Leaving it off for best performance is reasonable.


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