Kent wrote: > On Tue, 19 Jun 2007 19:50:20 -0500, Jochen Schroeder > <[EMAIL PROTECTED]> wrote: > >> Carsten Haitzler (The Rasterman) wrote: >>> On Tue, 19 Jun 2007 21:23:33 +0000 (UTC) Alec >>> <[EMAIL PROTECTED]> >>> babbled: >>> >>> >>>>>> I've been using powertop to reduce the number of wakeups on my >>>>>> laptop, >>>>>> and currently enlightenment is top of the list at around 4 per >>>>>> second. >>>>>> >>>>> AFIAK there aren't any patches floating around, but you can change >>>>> polling >>>>> intevals for modules and tweak the configs, closing all the >>>>> windows etc. >>>>> >>>> Yup, I only have the pager module enabled, no activity and no >>>> windows aside >>>> from the powertop xterm. >>>> >>>> >>>>> I think the 3rd party net/wlan modules caused a lot more wakes >>>>> than just >>>>> 4... I'm not sure how low you can go, since I can't see less than >>>>> 61 wakes >>>>> from the radeon driver, but with e17 idle in xorg, I get 99% of >>>>> the time >>>>> in C3. >>>>> >>>> True, the ipw2100 and the usb mouse cause ~4/sec each and prevent >>>> the kernel >>>> from reaching C3. With both of these gone and NoDRI for the radeon >>>> driver, I >>>> can get the kernel into C3 state most of the time with ~6-8 >>>> wakeups/sec. Of >>>> this, e17 is 4/sec, hence it would be nice to find the culprit and (if >>>> possible) remove it. >>>> >>> >>> if the mouse causes 4 interrupts/sec - this probably cause mouse >>> events? thus x >>> wakeups and then e wakeups to get the events. >>> >>> those 4 could be: >>> >>> 1. something polling - what, i don't know, but you will need to >>> strace and/or >>> debug and find out. as already pointed out some modules like to poll >>> - but most >>> of them its in the 1 per second or multiple seconds between polls >>> (except >>> cpufreq. >>> 2. it could be the result of an x client changing a property etc >>> etc. like a >>> titlebar etc. see #1 - need to debug. >>> 3. every 10 secs e pings x clients to see if they are alive if they >>> say they do >>> the netwm ping protocol, but if you have enough windows these pings >>> won't >>> happen at the same time so they will be spread out based on when the >>> window >>> came up. >>> >>> >> Would it make sense to just have e ping all windows at the same time. >> This would mean that a new window might not get pinged for almost 20s, >> but is that so bad. I think as soon as one has a large amount of windows >> open (which I have all the time, hell why not use all those virtual >> desktops :)) this method would be better even if the polling was reduced >> to 5s. I don't know how feasible this is and I know you have a lot more >> important things on your plate it's just an idea. >>> i share your desire to reduce this, though 4/sec is really minimal >>> when you >>> think about it :) >>> >>> >> I agree. Sony disables the hpet timer in bios and don't put an option in >> to enable it. I have ~ 100 wakeups/s just caused by the kernel because >> of this. >> <rant> >> The Sony bios really sucks. They have a bloody option to enable/disable >> a bios splash screen, but both hpet and virualization support are >> disabled and no way of enabling them. This is on an vaio sz, so their >> business line laptops. >> </rant> > > BIOS is generally a dissapointment, but I have a supposedly HPET > unsupported ICH3 chipset on my laptop, with no mention of just about > anything in the BIOS. I was able to use HPET with a patch from > http://www.tglx.de/projects/hrtimers/ to force the kernel to use hpet > with the 2.6.22-rc5-hrt1 patches. YMMV but, after applying, I saved > maybe 5W on this thing giving me an extra hour to leave the laptop > running in the car. :) > > --Kent > I already downloaded the kernel sources and the patch from powertop.org, don't know if it's the same one as the one you mentioned. Just didn't have time to compile it yet. Cheers Jochen
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