FreeBSD, Centos and ZFS - SOLVED

aurfalien aurfalien at
Wed Oct 23 00:16:40 UTC 2013

On Oct 22, 2013, at 5:04 PM, Charles Swiger wrote:

> Hi--
> 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.

The odd thing is that disabling Speed Step auto disabled Turbo Boost w/o allowing me to enable just it.

Also to note is that CentOS had no issues with having them both enabled.  So if a FreeBSD dev would like to jack in my system and have a looksy, you are more then welcome.

The odd performance degradation still held in FreeBSD10 until I disabled the above.

- aurf

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