Are there any other issues you'd like to me pass on to Ubuntu? Either tweaks of existing settings (which might get past the Hardy feature freeze), or longer term features?
On Feb 17, 2008 4:15 PM, Arjan van de Ven <[EMAIL PROTECTED]> wrote: > no; for that you want to increase the sampling rate, that actually has makes > the system go > to full speed faster. Changing up_threshold is just giving the algorithm more > cushing for > sampling errors (btw the measurement errors are going away really soon, Venki > is switching > ondemand over to an exact measurement rather than sampling, at which point > up_threshold can go away too) OK, in Ubuntu I get: powersave_bias 0 sampling_rate 80000 sampling_rate_max 40000000 sampling_rate_min 40000 Do these seem sane for an average desktop on AC power? Also I've read that (counter-intuitively) setting sampling_rate to sampling_rate_max reduces the sampling rate, e.g. http://www.lesswatts.org/projects/powertop/known.php Is this correct? > > The only reference to up_threshold I found on this list was > > http://www.mail-archive.com/[email protected]/msg00699.html > > which mentions using an up_threshold of about 75% when not in > > power-saving mode. > > > > So, there is little point in going much below 75%, even on AC power? > > yep Gnome power management seems to want to set these according to performance_ac and performance_battery. Setting these to 55 and 35 gives a up_threshold of 73% and 86% respectively (rather than 31% and 90%). Do you agree with this change? > Also, you're just making the second most common thinko that the gnome/desktop > folks tend to make. > "On AC" is not equivalent with "don't care about power saving". Sadly too > many people make that > leap... but just talk to a datacenter operator and he'll explain to you that > "on AC" means "must save more power" :) I agree that there isn't much use is saving power on desktop during the rare periods they are in use. However, personally it desktops on AC that I am most interested in saving power, an interest that started when I noticed that the fan on my Dual Core could keeping me awake from the other side of the house. Across the several million Ubuntu desktops, just winding down those fans on idle would mean that the world needs to build one less multi-megawatt powerplant. (To do this I used the BIOS settings, not sure how to do it within Linux) I'd really like desktop machines to turn off or turn down everything that is not in use; e.g. perhaps automatically cut network speeds to 10Mbps half-duplex when idle. Saving power is definitely different on the desktop though: switching the network card to 10Mbps half-duplex when the screensaver comes on would be kind of silly on a server ;) The UCC runs a small machine room. The other big difference I notice from the desktop mentality is that although losing AC makes power-saving that much more important, losing AC tends to refer to losing one of the Air Con units. -- John C. McCabe-Dansted PhD Student University of Western Australia _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
