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Estel's Avatar
Estel is offline Estel
2011-09-21 , 08:41
Posts: 5,028 | Thanked: 8,613 times | Joined on Mar 2011
#1621
Using 500 mhz as minimum is more "productive" in terms of powersaving and avoiding wear on CPU (although, the second effect is probably very little). When You're using 500 mhz as min, Your CPU spend much more time @ 0 mhz during idle (every second, it's sitting ~2x longer at 0 mhz, after doing task @ 500 mhz), so you got additional benefit of saving on power leakage.

so, probably it's not about harm, but additional benefit It's also possible, that he doesn't have idea of power leakage etc, just like to have 500 mhz as starting point
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michaaa62 is offline michaaa62
2011-09-21 , 08:53
Posts: 2,102 | Thanked: 1,937 times | Joined on Sep 2008 @ Berlin, Germany
#1622
Originally Posted by efeinblatt View Post
Let me simplify my problem. I am unable to deinstall kernel-power.

Code:
sudo gainroot
apt-get install --reinstall -y kernel kernel-flasher
returns



When I try to do it automatically with Nokia Kernel, I get the following message:


Yes, I am connected to the internet. Application Manager is not running. I've tried with usb connection, ac connection, and no connection. Battery is full.
Did you disable some of the original repos???
[1|root@Nokia-N900|~]apt-get install --reinstall -dy kernel kernel-flasher
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 2 reinstalled, 0 to remove and 5 not upgraded.
Need to get 1889kB/2046kB of archives.
After this operation, 0B of additional disk space will be used.
Get:1 https://downloads.maemo.nokia.com ./ kernel 2.6.28-20103103+0m5 [1889kB]
Fetched 1889kB in 30s (61,4kB/s)
Download complete and in download only mode
 
reinob is offline reinob
2011-09-21 , 09:07
Posts: 1,808 | Thanked: 4,272 times | Joined on Feb 2011 @ Germany
#1623
Originally Posted by Estel View Post
Using 500 mhz as minimum is more "productive" in terms of powersaving and avoiding wear on CPU (although, the second effect is probably very little). When You're using 500 mhz as min, Your CPU spend much more time @ 0 mhz during idle (every second, it's sitting ~2x longer at 0 mhz, after doing task @ 500 mhz), so you got additional benefit of saving on power leakage.

so, probably it's not about harm, but additional benefit It's also possible, that he doesn't have idea of power leakage etc, just like to have 500 mhz as starting point
That's probably true, but also probably would depend heavily on what exactly is run by the N900 when in idle.

One could also argue that fixing the frequency to, say, 600Mhz (or 900Mhz or whatever) would also provide a benefit (race-to-idle and so), so the phone would only alternate between 0 and 600.

On the other hand, there may be background tasks (e-mail sync, etc.) which hopefully can manage to do their thing without forcing the CPU to jump to higher frequencies (e.g. do the e-mail check at 250Mhz), in which case you would save a bit of power, especially in combination with IGNORE_NICE_LOAD.

When I have some time (lol) I will test with powertop what happens when I set the minimum to 600Mhz instead of 250Mhz and keep the phone idle with WLAN (or EDGE, I normally don't use 3G) and Nokia Messaging running (that's my usual "idle" situation).
 
Estel's Avatar
Estel is offline Estel
2011-09-21 , 10:53
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#1624
Nice idea, reinob (tests). As for locking to (for example) 900 mhz, I would not recommend this, due it being "overclocked" (500 mhz is standard frequency). It may be just placebo, but I would not like to "stress" CPU with higher voltage and frequency for 100% of running time.

As for things that doesn't force frequency jump, it's a matter of fact, that on 250 mhz it take 2x more time than on 500 mhz (usually - we're talking about things that doesn't involve high I/O from disk etc). so you benefit from more idle time = no leakage during 0mhz period. At the same time, een on 500 mhz CPu isn't overclocked (600 mhz is stock max frequency, but it *is* factory overclocked, according to CPU specifications).

/Estel
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N900's aluminum backcover / body replacement
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N900's HDMI-Out
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Camera cover MOD
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Measure battery's real capacity on-device
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TrueCrypt 7.1 | ereswap | bnf
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Hardware's mods research is costly. To support my work, please consider donating. Thank You!
 

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TMavica's Avatar
TMavica is offline TMavica
2011-09-21 , 11:00
Posts: 2,021 | Thanked: 1,060 times | Joined on Apr 2010 @ Hong Kong
#1625
installed v49, all is fine
no need to pin
 
freemangordon is offline freemangordon
2011-09-21 , 11:44
Posts: 3,074 | Thanked: 12,960 times | Joined on Mar 2010 @ Sofia,Bulgaria
#1626
Originally Posted by TMavica View Post
installed v49, all is fine
no need to pin
Where did you get v49 from?
 
freemangordon is offline freemangordon
2011-09-21 , 12:09
Posts: 3,074 | Thanked: 12,960 times | Joined on Mar 2010 @ Sofia,Bulgaria
#1627
@Pali - when do you plan to release new KP version as was agreed?
 

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pali is offline pali
2011-09-21 , 12:12
Posts: 2,154 | Thanked: 8,464 times | Joined on May 2010
#1628
UNTESTED PRE v49 is on http://atrey.karlin.mff.cuni.cz/~pali/
 

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werks is offline werks
2011-09-21 , 12:12
Posts: 41 | Thanked: 13 times | Joined on Feb 2010 @ Australia
#1629
Originally Posted by reinob View Post
We've discussed this issue just a few pages ago in this thread, although in the end it wasn't clear even if the problem existed at all.

Can you "prove" that your CPU is actually going down to 125Mhz, or is that merely the output of "kernel-config show".

If the frequency is being avoided, it doesn't matter if the minimum is set to that frequency. Check with e.g. conky and see how low the CPU goes with nothing else running (or use powertop if you know how to).

AFAIK most people avoid 125Mhz but allow 250Mhz, which doesn't seem to harm. Why do you need to avoid both 125 and 250?
your right i cant prove it, just from kernel-config show.
thanks man.
 

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TMavica is offline TMavica
2011-09-21 , 12:32
Posts: 2,021 | Thanked: 1,060 times | Joined on Apr 2010 @ Hong Kong
#1630
Originally Posted by freemangordon View Post
Where did you get v49 from?
In your friend web site, LOL
I saw it and install directly, no need thinking
 
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