On Sat, 14 Nov 2009, Robert Hancock wrote: > 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 > 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. Agreed, though not all systems have these delays -- choose wisely:-) > 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.. ditto. > 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.) Yes, I agree think that these external forces are effective in getting system vendors in line. Another is formal RFQ's for large purchases where the customer specifies exactly what they want. cheers, -Len -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
