Date: Fri, 21 Mar 2008 07:52:20 -0700 (PDT) From: Abdullah Ibn Hamad Al-Marri <wearabnet@yahoo.ca> To: Maxim Sobolev <sobomax@FreeBSD.org> Cc: FreeBSD Current <current@FreeBSD.org> Subject: Re: Speed Step and powerd for servers status? Message-ID: <994010.61982.qm@web33702.mail.mud.yahoo.com>
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----- Original Message ---- > From: Maxim Sobolev <sobomax@FreeBSD.org> > To: Abdullah Ibn Hamad Al-Marri <wearabnet@yahoo.ca> > Cc: FreeBSD Current <current@FreeBSD.org> > Sent: Tuesday, March 18, 2008 10:49:29 PM > Subject: Re: Speed Step and powerd for servers status? > > Abdullah Ibn Hamad Al-Marri wrote: > > Hey, > > > > > > I would like to use powerd and speed step for my servers, and make sure it > will use the MAX CPU if needed then go to idle mode to save the power. > > > > Any recommendation? > > It's questionable whether or not it will have positive effect on the server: > > > The combination of processor-frequency scaling and idle-power states > provides a somewhat surprising result. On almost all modern hardware, if > there is code to run, then it is more power efficient to run the > processor at full speed. This "race to idle" concept stems from the > power consumption of an idle processor being much lower than an active > processor, even if running at a lower speed. The overall power > consumption will be less if the processor spends a short time at full > speed and then falls back to idle, rather than spending twice as long > being active at a lower frequency. > > > Full text is here: > > http://www.acmqueue.com/modules.php?name=Content&pa=showpage&pid=513 > > -Maxim > Helli Maixm, Did you try it with mysql bench or ubench? Regards, -Abdullah Ibn Hamad Al-Marri Arab Portal http://www.WeArab.Net/ ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
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