On 11/06/2009 11:30 PM, Len Brown wrote:
Thanks for the suggestions. final abstract is here: http://events.linuxfoundation.org/eus09hpc4 presentation being constructed here (currently draft 0.5): http://userweb.kernel.org/~lenb/doc/2009-EUS-Server-PM-web/index.html cheers, -Len Brown, Intel Open Source Technology Center
I noticed you mention that "power off is a valid power management strategy".. indeed you can use WOL to power up again, and Linux can boot quickly, unfortunately the boot speed on most server platforms in the BIOS before even starting to boot the OS is abysmal, and seems to be getting worse there as it improves in desktop systems. Some IBM servers take MINUTES just to initialize the RAID controller.. this sort of thing isn't exactly conducive to rapid power-up of servers when required.
Also, the power-off power usage of some servers isn't great either - some of them even have to keep the power supply fans running when powered off, otherwise presumably the PS would heat up too much..
Presumably in both of these cases it's because of a lack of demand for better behavior (fast power-up on desktops is demanded by Microsoft "designed for Windows" specs, and low power-off power usage is required by Energy Star, EU standards, etc.)
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