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Re: Energy consumption vs % utilization?
Steven M. Bellovin wrote:
In message <Pine.WNT.email@example.com>, Alex Rubenst ein writes:I doubt that very much, or we wouldn't have variable speed fans. I've monitored CPU temperature when doing compilations; it goes up significantly. That suggests that the CPU is drawing more power at such times.
From running a Colo in a place with ridiculus high electricity engery costs (Zurich/Switzerland) I can tell you that the energy consuption of routers/telco (70%) and servers (30%) changes changes significantly throughout the day. It pretty much follows the traffic graph. There is a solid base load just because the stuff is powered up and from there it goes up as much as 20-30% depending on the routing/computing load of the boxes. To simplify things you can say that per packet you have that many "mWh" (milli-Watt-hours) per packet switched/routed or http requests answered over the base load. I haven't tried to calulate how much energy routing a packet on a Cisco 12k or Juniper M40 cost though. Would be very interesting if someone (student) could do that calculation. -- Andre