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Your statement was that the on-demand governor is "very bad" for amd |
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CPUs. I don't see how you have qualified that statement in any way. |
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Yes, it behaves differently then the conservative governor but that |
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doesn't make it "bad", "harmful", or even inefficient with power usage. |
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|
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I use the ondemand govern on a large number of production Opteron |
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machines with great results. According to my empirical measurements |
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with an ammeter it saves an average of ~35w per socket in systems with |
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dual core CPUs (not per core). As you can imagine, this is a pretty use |
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full savings for the 8-socket system that I have. |
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|
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Cheers, |
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|
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-J |
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|
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-- |
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On Fri, Aug 03, 2007 at 02:50:48PM +0200, Beso wrote: |
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> the ondemand governor steps the processor between the least step to the most |
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> one. for example, i have a turion 64 with steps from 800mhz to 2ghz. the |
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> ondemand governor would step from 800mhz directly to 2ghz when the cpu is |
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> under load and then return to 800 mhz when the load drops down. |
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> the conservative governor instead steps to the most intelligent frequency |
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> when it is needed. on my processor it steps to 1200mhz, or to 1,6ghz or |
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> 1,8ghz based on the load of the processor, but sometimes it lags a bit |
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> before going to upper steps. of course you can set it according to the wiki |
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> and forum information in the best way for your system. |
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> then there are powernowd and powerthend, which are based on userspace |
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> governor. |
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> i'm actually using the first one (which is in the gentoo main repository) |
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> and i find quite good with it, that steps quite good and in a quite smooth |
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> way. i'll look for some tweaking for it because there are still some things |
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> i don't like (mainly when copying to a truecrypted volume). |
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> the last one is another daemon which is outside the gentoo repository, so |
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> you'll have to go to their site ( http://powerthend.scheissname.de/ ) and |
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> add the overlay to portage or you can download the source and compile it |
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> manualy. i reccomend adding the overlay so that you can have it in the world |
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> db. this one is quite a good daemon but for my standards it jumps too much |
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> the processor current speed but it is really good cause i don't even know of |
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> processor lags when transitioning from one step to another if i don't take a |
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> look at kima (a little kmenu applet that let you see thermal temp, core |
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> temp, cpufreq speed, uptime, and proc speed, that normally is equal to the |
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> cpufreqspeed). if you'd like to try it, try it first and if you think that |
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> is steps too much turn to powernowd. |
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> the only thing that you need to know is that this 2 daemons need the |
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> userspace governor built in the kernel or loaded and set when they start. |
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> for that reason i use cpufrequtils to set the governor to userspace and |
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> powernowd/powerthend to actually set the cpu speed of my processor. |
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> i've read that you had a new processor with cool&quiet so i think that you |
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> should really use this tools to get the powernowd! technology working. maybe |
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> on the wiki you could find something also about cool&quiet and on how to |
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> tune it. |
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> the last thing i would advise to use is the klaptopdaemon. it is a fantastic |
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> kde daemon that is capable of controlling cpu steps, standby, suspend which |
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> are quite great, at least for my laptop. i don't know if it works also on a |
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> desktop, but if not there is kpowersaved which is quite good also. |
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> |
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> 2007/8/3, Raffaele BELARDI <raffaele.belardi@××.com>: |
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> > |
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> > Beso, |
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> > |
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> > that is an interesting observation, can you elaborate a bit? |
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> > |
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> > thanks, |
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> > |
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> > raffaele |
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> > |
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> > Beso wrote: |
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> > > |
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> > > and for amd users, i suggest not using the ondemand governor cause it |
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> > > uses the cpu in a very bad way. use conservative one or userspace with |
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> > > powernowd or powerthend (the last one on my systems gave a better |
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> > > efficiency). |
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> > > |
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> > |
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> > -- |
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> > gentoo-amd64@g.o mailing list |
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> > |
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> > |
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> |
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> |
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> -- |
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> dott. ing. beso |