Date: Tue, 22 Oct 2013 17:16:38 -0700 From: aurfalien <aurfalien@gmail.com> To: Charles Swiger <cswiger@mac.com> Cc: FreeBSD - <freebsd-questions@freebsd.org> Subject: Re: FreeBSD, Centos and ZFS - SOLVED Message-ID: <763A1418-CE0A-40D3-9FAB-F2496197FE2C@gmail.com> In-Reply-To: <852AD883-D21A-4E34-9907-BF78696DE069@mac.com> References: <CBA24BB3-4A57-428C-B342-4BEB678B8D43@gmail.com> <1381600575.18393.33219025.5D7B78D0@webmail.messagingengine.com> <8CA809B3-1692-4760-A63F-9D7451EB49BD@gmail.com> <525D143B.50202@gmail.com> <DF3E552D-D2E6-464C-88EA-7AF34E8329CC@gmail.com> <1382285088.2462.36238881.1AA6BB17@webmail.messagingengine.com> <25C055B9-4A19-46C8-B78E-AC8BD6E00CD9@gmail.com> <852AD883-D21A-4E34-9907-BF78696DE069@mac.com>
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On Oct 22, 2013, at 5:04 PM, Charles Swiger wrote: > Hi-- > > On Oct 22, 2013, at 4:40 PM, aurfalien <aurfalien@gmail.com> 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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