Messages in this thread | | | Date | Sat, 24 Apr 2010 06:56:26 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH 7/7] ondemand: Solve the big performance issue with ondemand during disk IO |
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Hi!
> > Well, and now, if you do something like cat /dev/<your usb1.1 hdd> > > > /dev/null, you'll keep cpu on max frequency. Not a problem for new > > core i7, but probably big deal for athlon 64. > > do you have facts not speculation for this? Does the athlon 64 really > keep its voltage high during idle? That would surprise me greatly...
So... some old data. It is not exactly athlon 64 -- I don't have that particular number for it -- but: (from my old notes):
evo n620c [63.3 Wh] ~~~~~~~~~~~~~~~~~ idle machine at 1.7GHz, min bl: 13.0 W idle machine at 600MHz, min bl: 12.0 W
thinkpad x32 [52Wh] ~~~~~~~~~~~~ idle machine at 600MHz, min bl: 10 W at 1.8GHz: +6.6 W
hp nx5k [56.8Wh] ~~~~~~~ idle, min bl: 19 W min bl, 1.4GHz: 22 W
...so yes, I kind of see a pattern there. And you should be able to easily see the difference, too, if you took something from that era...
Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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