Active Topics
-
Camera phone competition March 2023 "Endless" (35)
to General by Maemish - 3 days, 6 hrs ago -
TLS 1.2 for N9 is ready (28)
to MeeGo / Harmattan by smartblu9 - 3 days, 8 hrs ago -
Maemo repository (3)
to Community by torsen - 3 days, 23 hrs ago -
Error after installing Leste on sdcard (11)
to Maemo 7 / Leste by Maemish - 4 days, 21 hrs ago -
Introducing ubiboot N9 (multiboot OS loader) (1,393)
to Alternatives by smatkovi - 6 days, 3 hrs ago - more...
|
2010-09-17
, 13:18
|
|
Posts: 86 |
Thanked: 28 times |
Joined on Jan 2010
@ That beer and prezels country in Europe -_-
|
#12
|
Speeding up the processor results in speeding up the internal system clock, it's the heartbeat of the system and measures almost everything.
If you're speeding up too much / heating up the hardware to limits the clock dependant components will miss a beat or see it as "background noise" (remember, everything is analogue signals, they're being digitized and filtered).
So the clock will have somewhat an arrhythmia and therefore precise timing operations are more likely to fail. This includes RAM and also disk- / mmc-writes.
The faster you go, the faster will the flanks of the signal rise and fall.
The lower voltage you go, there is more possibility the signal will decarded as noise.
Explained in layman's terms, reality is somewhat complexer.
Good news:
- it COULD break your filesystem -> reflash
- nothing to worry about if you keep regular backups (!!)
If you're speeding up too much / heating up the hardware to limits the clock dependant components will miss a beat or see it as "background noise" (remember, everything is analogue signals, they're being digitized and filtered).
So the clock will have somewhat an arrhythmia and therefore precise timing operations are more likely to fail. This includes RAM and also disk- / mmc-writes.
The faster you go, the faster will the flanks of the signal rise and fall.
The lower voltage you go, there is more possibility the signal will decarded as noise.
Explained in layman's terms, reality is somewhat complexer.
Good news:
- it COULD break your filesystem -> reflash
- nothing to worry about if you keep regular backups (!!)
| The Following 5 Users Say Thank You to Renkon For This Useful Post: | ||
|
|
2010-09-17
, 13:20
|
|
Posts: 179 |
Thanked: 49 times |
Joined on Nov 2008
|
#13
|
Originally Posted by toxaris
I've had 2 n900's now (accident, insurance replacement).
Hello.
I have found a strange behavior when OC to 850mhz.
I open up www.dn.se and navigate to almost any underpage, the browser starts to load the page and after a while after some scrolling/zooming the page reloads and the phone crashes.
This never happens if the phone is running stock clock (600mhz).
See this video:
http://www.youtube.com/watch?v=E8D1e_9kXz8
Anyone else experience this?
1st N900, i had on an 850 OC all the time and it worked fine.
2nd N900, i OC'd it to 850 and it crashed all the time, so i dropped it down to 805 and it's worked fine ever since.
(It actually works fine on 1000 OC aswel, just not 850, strange).
|
|
2010-09-17
, 13:21
|
|
Posts: 999 |
Thanked: 1,117 times |
Joined on Dec 2009
@ earth?
|
#14
|
Originally Posted by Renkon
That's a great description of the overclocking effects on the n900. Your post should be in the wiki!
Speeding up the processor results in speeding up the internal system clock, it's the heartbeat of the system and measures almost everything.
If you're speeding up too much / heating up the hardware to limits the clock dependant components will miss a beat or see it as "background noise" (remember, everything is analogue signals, they're being digitized and filtered).
So the clock will have somewhat an arrhythmia and therefore precise timing operations are more likely to fail. This includes RAM and also disk- / mmc-writes.
The faster you go, the faster will the flanks of the signal rise and fall.
The lower voltage you go, there is more possibility the signal will decarded as noise.
Explained in layman's terms, reality is somewhat complexer.
Good news:
- it COULD break your filesystem -> reflash
- nothing to worry about if you keep regular backups (!!)
__________________
I like cake.
I like cake.
|
|
2010-09-17
, 13:23
|
|
Posts: 86 |
Thanked: 28 times |
Joined on Jan 2010
@ That beer and prezels country in Europe -_-
|
#15
|
@munkiii:
what voltage profile you're on?
xlv, ulv, ul, ideal, default?
@johnel:
Well, let's wait some more time to be corrected by someone else
Maybe there is someone with more knowledge on this area, I've just remembered this from my univ. course about digital signals. Mileage may vary from device to device, this is just the general concept.
Last edited by Renkon; 2010-09-17 at 13:27.
what voltage profile you're on?
xlv, ulv, ul, ideal, default?
@johnel:
Well, let's wait some more time to be corrected by someone else
Maybe there is someone with more knowledge on this area, I've just remembered this from my univ. course about digital signals. Mileage may vary from device to device, this is just the general concept.
Last edited by Renkon; 2010-09-17 at 13:27.
|
|
2010-09-20
, 07:36
|
|
Posts: 424 |
Thanked: 196 times |
Joined on Mar 2010
@ Sweden
|
#16
|
Originally Posted by munkiii
Yea, maybe go down to 800. But the bigest reason to OC for me was lower the voltage and save energy. Its very rare that Im in need of 800mhz. Maybe I should go make a new profile with just lower voltage.
I've had 2 n900's now (accident, insurance replacement).
1st N900, i had on an 850 OC all the time and it worked fine.
2nd N900, i OC'd it to 850 and it crashed all the time, so i dropped it down to 805 and it's worked fine ever since.
(It actually works fine on 1000 OC aswel, just not 850, strange).
|
|
2010-09-20
, 08:13
|
|
Posts: 842 |
Thanked: 1,197 times |
Joined on May 2010
|
#17
|
You -need- to make your own voltage profile. By this I mean you need to test each frequency under load, undervolt it till it crashes, then up it by 2 units.
Each N900 is different, and as such you can't assume any profile will work with yours.
Each N900 is different, and as such you can't assume any profile will work with yours.
|
|
2010-09-20
, 08:28
|
|
Posts: 604 |
Thanked: 108 times |
Joined on Feb 2010
@ Phoenix, WA
|
#18
|
Originally Posted by Renkon
x2, i cant believe everyone was so quick to critisize without even asking of the voltage profile. For me, as per Jakiman's recommendation, i do
@munkiii:
what voltage profile you're on?
xlv, ulv, ul, ideal, default?
@johnel:
Well, let's wait some more time to be corrected by someone else
Maybe there is someone with more knowledge on this area, I've just remembered this from my univ. course about digital signals. Mileage may vary from device to device, this is just the general concept.
kernel-config load lv
kernel-config limits 250 850
If I were to try 850 without lv then all my stuff crashes too. but then, when I go to 900, if i turn on lv everything crashes :P its tricky, but try different voltage profiles at 850.
 |
|
2010-09-20
, 09:01
|
|
Posts: 1,210 |
Thanked: 597 times |
Joined on Apr 2010
@ hamburg,germany
|
#19
|
i have titans lv profile at 850 mhz but no crash at this site.
but the site is eating cpu and ram resources like hell.
you should try another app that eats much cpu and ram like a emulator or a big movie.
but the site is eating cpu and ram resources like hell.
you should try another app that eats much cpu and ram like a emulator or a big movie.
__________________
Nobody likes us but we dont care....
Nobody likes us but we dont care....
|
|
2010-09-20
, 09:50
|
|
Posts: 1,425 |
Thanked: 983 times |
Joined on May 2010
@ Hong Kong
|
#20
|
Originally Posted by toxaris
Some time a particular freq. range doesn't work for you, consider changing to some other range.
Hello.
I have found a strange behavior when OC to 850mhz.
I open up www.dn.se and navigate to almost any underpage, the browser starts to load the page and after a while after some scrolling/zooming the page reloads and the phone crashes.
This never happens if the phone is running stock clock (600mhz).
See this video:
http://www.youtube.com/watch?v=E8D1e_9kXz8
Anyone else experience this?
If you look at the OC profile you selected(starving in this example, and provided that you're using titan's power kernel), you can find a list of selectable freq.:
Code:
FREQS="0:22,90 125:22,90 250:28,180 500:29,360 550:32,400 600:34,430 700:41,430 750:42,430 805:45,430 850:46,500 900:49,500 950:52,500 1000:55,500 1100:63,520 1150:69,520"
Similar case for min. freq., though I usually set it to 500 for OC.
In my case, 500-950 is more stable than 500-850. YMMV.
Load up OC profile only when need(to save your battery, to make phone app more stable, etc.). You may setup Queen's Becon Widget to load/unload OC profile on desktop.
Hope this help.
Last edited by 9000; 2010-09-20 at 09:53.
is that the memory?
if i did help you, just click "Thanks" on the lower right of my post. thanks!
"The best way to break a Spell is to prevent it from being cast in the first place"
N900: 1000/1150mhz; sampling_rate 15; up_threshold 150000;