Develop Bugs

Do kernels affect network speed?

I have noticed a HUGE drop in network speed since flashing a new kernel. I'm talking a drop from 1-1.3mb down to 300-500kb. What gives?
Sent from my PC36100 using XDA App

Bump. Kind of interested in the answer myself.
Sent from my FROYO'D EVO using xda app

I'm not sure if its the kernel.. when I rooted my phone and changed rom, I indeed had double the speed I had stock. I asked this a few times around here and no one replied.. I notice with true static kernel I go into data roaming. Again Not sure. But when I had and will switch badlck to is snap 8.1 850. So I'd like to know this too..
Sent from my PC36100 using XDA App

Make sure it's not something simple as testing at different times of day. Testing late at night or early morning and you'll always see fester speeds with less network traffic.

same here - the drop in speeds for me hasnt been as bad if i using a cm6 nightly but if i go back to sense rom the speeds are horrible

I've been continuing to test my speeds throughout the day, even on different servers. My download speed has struggled to reach 1.0mb on maybe one out of 10 times. The biggest problem I'm seeing is my upload speed. It seems to be VERY unstable. Usually the test will freeze and then when it ends my speed ends up being something like 50kb. I've been on Calkulins EViO 1.1 for a while but I've been doing quite a bit of kernel testing. Right now I'm on King's BFS #8. I think when I get some time later I'm going to do some actual tests. I also installed and backed up the new Fresh 3.2 with the newest HTC stock kernel so I'll probably give that a try as well.

If you are using Setcpu try putting it in performance mode at 998 MHz or higher and see if you get better speeds. I have been doing some testing as my house is in a week signal area. It turns out most, if not all of these kernels are undervolted. Good for battery life, but it seems to reduce the radio's sensitivity. At my house I lose signal whenever my speed drops to 245 MHz, which indicates to me that the radio is not getting enough voltage to lock the signal. I could be wrong, but it would be interesting to see what you guys get if you force it to not drop the voltage. I think most of the kernels keep the voltage stock at 998 MHz or higher.

speeds across kernels & set cpu settings
This isn't the most scientific comparison but i would like to know if others are finding similar results. (i am located in NYC and still trying to figure out why sprint still doesn't have the 4G network running here - I know its up in a few small pockets..)
I think all of these results are pretty sad IMO - with that being said there seems to be a boost in speed when using setcpu at the performance setting:
The first three were run on Fresh's Newest 3.2 release (Supersonic 3.28.651.1) and the rest on CM6 final
Wiped cache and dalvik between Kernel swaps -
Round 1:
Fresh's newest kernel w/ no setcpu - average speed of 666 kbps down
Fresh's newest kernel w/ setcpu on peformance (998) - 849 kbps down
Round 2:
netarchy-toastmod-4.1.8-cfs-bfq-fresh-compatible- no setcpu -615 kbps down
netarchy-toastmod-4.1.8-cfs-bfq-fresh-compatible- setcpu (119)-758 kbps down
Round 3:
KiNgxKernel-Evo-8-BFS318-2.6.32.15- no setcpu - 609 kbps down
KiNgxKernel-Evo-8-BFS318-2.6.32.15- setcpu (119) -730 kbps down
Round 4:
CM6 FINAL - stock kernel - no setcpu - 908 kbps down

MJStephens said:
I have noticed a HUGE drop in network speed since flashing a new kernel. I'm talking a drop from 1-1.3mb down to 300-500kb. What gives?
Sent from my PC36100 using XDA App
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Click to collapse
I think the problem is just fluctuation in network speed. Also the other problem is the speedtest.net app! It is so freaking inaccurate yet everybody seems to like using it.....instead I recommend the xtremelabs.app in the market. I hear the website for speedtest.net is more accurate though. I have seen my network speeds flex from 300kb to 1.5 mb in my house.
Sent from my PC36100 using XDA App

New Sprint OTA 3.28.651.1 - HUGE DIFFERENCE
I just went back to the stock New Sprint OTA 3.28.651.1 - that flipz released a few days ago:
http://forum.xda-developers.com/showthread.php?t=773444
and my speeds are now between 1.2 and 1.5 on 3G - as compared to 650 - 700 kbps on the custom roms and kernels... might be worth looking into for those who are having issues.

[Q] advice on Undervolt/havs and overclocking

Yesterday I put the netarchy havs less kernel on my phone and with some stress testing and general testing found that it worked well at 1.15 mhz. I carried it around all day messing with it no problem. Today, the real test came when I ran GPS on my phone in my car. The phone lasted about 3 minutes of GPS before it started rebooting. Then my 4g was broke from it somehow. Anyhow, I restored my phone and all seems well now.
I still want to mod the voltage and clock speed. Any advice on this? The phone always gets hot when I use GPS because it uses a lot of processor, frequently its on the charger and possibly in sunlight. When it was not overclocked or undervolted my phone NEVER reboots not once since I've had it.
Is the problem the undervolting, overclocking or both? Should i give up on this due to the way I use my phone?
Thanks in advance.

Try different kernels. I use netarchy sbc 4.2.2 more havs, works great. I also use his 4.3.4 more havs sbc. They both work for me. Battery life is awesome and gps works good. No prob here. Try those out and see what happens. Hope this helps.
Sent from my HTC EVO Phone, should'nt we all have one?

Okay so is there any danger to this? It seems like every time my phone starts rebooting from overclocking or undervolting apps start disappearing from my phone and stuff stops working.
I use amon RA 2.3 and every time I recover it works again but I was just wondering how dangerous it is for me to experiment they way I have been. I have already recovered my phone 3 times from issues like this that broke it.

Every phone reacts differently to kernels, undervolting, and overclocking so you will have to experiment to find out what works for you and what doesn't. Just make sure that you dont check the "set on boot" box until you know your setup is stable. A reboot shouldn't hurt anything though.
I am running Netarchy 4.3.4 more havs, overclocked to 1190 and it's as stable as can be on my phone. However, if I go over 1190 it immediately locks up and reboots.
Sent from my HTC EVO 4G with Tapatalk

kd0axs said:
Every phone reacts differently to kernels, undervolting, and overclocking so you will have to experiment to find out what works for you and what doesn't. Just make sure that you dont check the "set on boot" box until you know your setup is stable. A reboot shouldn't hurt anything though.
I am running Netarchy 4.3.2 more havs, overclocked to 1190 and it's as stable as can be on my phone.
Sent from my HTC EVO 4G with Tapatalk
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Yeah but the reboots are hurting my phone! I have to restore it due to the problems the reboots and freezing causes (sometimes I have to battery pull due to full lockup). 2 times when I pulled battery due to full lockup apps went missing from phone memory but the available space on the phone was as if the apps were still there. Another time my 4g wouldn't turn on.
Is that abnormal? Can it mess up my phone in a way that recovering wont be able to fix or is recovering generally a sure shot?

The reboots should not be hurting the hardware, unless you overclock excessively. What the reboots are doing is corrupting your file system because open files do not get closed properly.
Are you after speed or battery life? I think the two are mutually exclusive. If you have great speed (be it governor or because of overclock), you will pay the price in battery life. I think the trick is to find the balance between the two that suits *you*.

gpz1100 said:
The reboots should not be hurting the hardware, unless you overclock excessively. What the reboots are doing is corrupting your file system because open files do not get closed properly.
Are you after speed or battery life? I think the two are mutually exclusive. If you have great speed (be it governor or because of overclock), you will pay the price in battery life. I think the trick is to find the balance between the two that suits *you*.
Click to expand...
Click to collapse
Because I use the 1-1-1 power management system (see sig) my main concern is performance. I love my phone and when I use it I want it to be fast and smooth. I would *prefer* if the extra speed didn't dramatically change my battery life but I'm okay with a small decrease in battery life if the speed gain is reasonable for the tradeoff. Anyhow I thought a lot of people ran HAVS along with overclocking to have both to a degree.
Only time I charge my battery is when I am using it in the car with my car charger. At home I charge all my batteries on an external charger - my phone is a mobile device I prefer to never be bound to a cord. I sleep with my phone next to me off the charger lol.

Okay so my phone is running more HAVS now and it seems the same as before so I guess my friend is HAVS friendly. I will run this for a day to check if any reboots happen and aim for tomorrow to overclock again. It may have been the 1.19 mhz that caused the issue. I will drop it down to 1.15 or 1.1 and see if its stable.

Overclocking question, stability?

Okay, so my question is basically how stable is overclocking your g2? I typically keep it at 800 when I use my phone normally, than 1.5ghz for games. I wante d to keep my g2 at 1.5ghz forever.. is that bad?
My battery obviously increases in temp..

I just use 1GH. It's enough for all game now. and didn't see any bad to battery or phone

I've had my DZ for about three weeks now and all this time I've had it consistently overclocked to 1843MHz. At that high of a speed, I had to let the phone cool down after 20 minutes of use.
Just today I flashed pershoot's 1516MHz kernel and noticed no heat issues after ~45 minutes of consistent use (temps < 40C).

I have had my g2 for.... However long they been out. I have always been overclock to at least 1.5 with zero heat issues. I ran 1.8 and even 1.9 for a good long time as well. Those speeds have heat issues ones that required a battery pull a few times because it started heating up faster then i could shut down the phone. If your going to OC at those speeds makes sure you set temp profiles with alarms.
Sent from my HTC Vision using XDA App

ARM processors, like our snapdragons, are a lot more forgiving on the overclocking front than what you might find in your desktop, for instance.
I still treat overclocking on my phone like I do my computers, though... setcpu has a stress test built in that you can use if you're curious how "stable" your overclock is. but in my experience, I've found that you can get away with just playing around with it and using the phone normally and seeing how it reacts to different clockspeeds.
right now, I run it at 1.1ghz (24/7). I have run it at 1.5ghz (24/7) in the past for PSX/N64 emulators, but I've found with my new setup (pretty light; no widgets, very few things going on in the background, stripped as many unnecessary apps as possible, and not using any animations or fancy bits) that 1.1ghz is more than enough to be able to play the games I play on any emulator smoothly.
you should be fine at any speed that is currently available in the overclocking kernels we have with the exception of flippy's 1.9ghz kernel, which does require some monitoring to keep things cool and stable. but it still does vary from phone to phone. if you're running at 1.5ghz and the phone isn't doing anything wonky, then you shouldn't worry about it. if you're running it at 1.5ghz and you're experiencing stability issues, random force closes that aren't fixable through conventional methods, or heat issues, you should probably back off a bit.
some people have problems at 1.2ghz, some people are running at 1.9ghz all the time and never have problems... just find what works best for normal usage with your device and go with it.. it's not like we keep these things for more than a couple of years anyway, and the processor will be capable of handling the [stable] overclock for that period of time.

im always at 1.2ghz. 768 as min, interactive gov (when i use CM7) and battery has been fine, havent noticed any major issues. hard to tell if it was the rom bugs or OC being the issue but from what i read all my issues others have at various speeds so im guessing it was rom related

i think it depends on the rom.
when i use the Pyromod rom i dont need overclock but for other roms like sense roms those I require OC. I always keep it at 1400 when needed.

OC'ing

What's a safe level to overclock my phone to? I'm running the latest MIUI (1.9.16) with the lastest Tiamat kernel (1.1.3) I'm at about 1344 MHz right now. Can I go much highter?
Sent from my rooted, MIUI DInc2

From my testing, I've found there isn't to much to be gained going over 1.6ghz.
For a safe level I keep mine at 1.2 ghz. This has worked out well for me. Try different frequencies and see what works out for your needs.

I'm running JDKernel with the max set at 1.5 ghz, using the smartass governor. When I look at the "time in state" info, it usually shows about 75% of my time spent at 768 mhz. Seems to be working great.
Sent from my Incredible 2 using XDA App

Well, I tried bumping it up to 1.6, and I locked my phone and the screen turned off, but the keys stayed on, and it wouldn't come back up. So I pulled the battery and went back to 1.3 like it was before. Now its working great. I'm on smartass v2
Sent from my rooted, MIUI DInc2

If your having lockups, try installing Incredicontrol from the market and bump up the voltage on the higher frequencies 25-50mv, this should keep you from locking up. I do this when I use the performance governor and want to run Quadrant or Linpack .

PacerguyDon said:
If your having lockups, try installing Incredicontrol from the market and bump up the voltage on the higher frequencies 25-50mv, this should keep you from locking up. I do this when I use the performance governor and want to run Quadrant or Linpack .
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Click to collapse
I've been using SetCPU, cuz I couldn't understand Incredicontrol..... What's ideal if I'm running around 1.6 for voltage?

On the Jd Kernal, I'll bump it up to 1450 and go from there.

PacerguyDon said:
On the Jd Kernal, I'll bump it up to 1450 and go from there.
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Click to collapse
So, you don't know about for Tiamat? I'm using that one.
Plus, would anyone recommend using his Incredikernel as well?

I'll go about the same on the Tiamat. I usually will start at 50 mv over whatever the stock setting is on the kernel when running performance runs.
I didn't know that Chad had done a Kernel for Aosp romed Dinc2's. I know his Dinc1 Kernels were great.

I accidently had my phone at 1.9 for a day running jdkernel, no crashes or anything
Atm when my phone is charging, it gets bumped up to 1.4 and i have no issues at that speed.

[Q] what is the best battery saving kernel?

hey guys, i am looking for a kernel that will save me on battery. i am running zombie 4 rom. it says it runs the dark x kernel. i don't need to be running at super speeds but i don't want screen freezes either. i just want to be able to play my satellite radio without the phone draining 3 percent every 5 min or so. any help would be great.

edshawn911 said:
hey guys, i am looking for a kernel that will save me on battery. i am running zombie 4 rom. it says it runs the dark x kernel. i don't need to be running at super speeds but i don't want screen freezes either. i just want to be able to play my satellite radio without the phone draining 3 percent every 5 min or so. any help would be great.
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Click to collapse
I would be interested in this as well. Currently I am Rooted and have tried a few ROM's but haven't found one yet that doesn't have some bug or another. {Granted, I haven't tried them all} Tried one ROM that really distorted my custom made Wallpapers, which is a big deal to me. So... yes, any info on a better battery life Kernel would be welcome.
Currently I am not a "heavy user" on the phone. Talk - Text - You Tube occasionally... that's it. Constantly looking for better ways to improve this already amazing phone.

Eugenes kernel has given me great battery life. Either get down with Eugene's Macnut ROM which already has it or search for it under the general section under the bounty thread for Eugene. Its in page....58?
Keep in mind that the "beta" kernel does not have bln support but works just fine so long as you use the lionheart governor.
If you can't find the bounty thread then I'm sorry for you.

Synergy kernel has been awesome on battery for many.
Sent from my SGH-T989 using XDA App

I second just using macnut rom. I've tried em all, and his always gets the best battery life (for me).
I also undervolt via system tuner pro so that I'm at 1137 at 1.51
Sent from my SGH-T989 using xda premium

G1ForFun said:
Synergy kernel has been awesome on battery for many.
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+1 for Synergy, i got well over a day when i was running rooted stock debloated, etc. Also i use setcpu ondemand gov. 1620 max 384 min

edshawn911 said:
hey guys, i am looking for a kernel that will save me on battery. i am running zombie 4 rom. it says it runs the dark x kernel. i don't need to be running at super speeds but i don't want screen freezes either. i just want to be able to play my satellite radio without the phone draining 3 percent every 5 min or so. any help would be great.
Click to expand...
Click to collapse
How you use your phone determines the best way to get the best battery life. Basically there are two ways to save battery: cutting power when not in use and delivering less power to the processors.
If you use your phone intermittently throughout the day for texts or calls, you'll get the best battery results from kernels/ROMs/apps that cut unnecessary functions when you're not using the phone. For example, juice defender cuts your wifi and mobile data when your screen is off and reactivates it every 15min (can be configured otherwise) to check for notifications. Darkside's Digital Warfare utilizes something called "deep sleep" which actually completely turns off your processors when the screen is off, but keeps the basic cell radio on so if you receive a text/phone call it will wake up the processor. These functions have the largest and safest impact on battery life.
If you're constantly using your phone and you want better battery life, you basically only have one option: undervolting. This is essentially supplying less power to your processors, which can be done through system tuner. It's not a free ticket, however; if you undervolt too low then at higher frequencies (playing games, etc.) your processor will become unstable and your phone will randomly reboot. If you encounter this, then don't undervolt that much and up the voltage to the last safe level. Just for reference, undervolting by 50mV is usually considered safe and undervolting past 100mV usually results in boot loops. But how far you can actually undervolt depends on your individual phone hardware, there's no universal answer. Make sure to not set your undervolt settings to set at boot until you find a stable voltage. Otherwise, you'll be forced to restore a nandroid if you encounter a bootloop.
TL;DR
If your phone already lasts a day and you want it to last 2-3 days, look into ROMs/kernels/apps that cut unnecessary functions when not in use. Most effective way to extend battery.
If your phone lasts 8 hours and you want it to last a day because you're a heavy user, look into undervolting with system tuner.

kernel darkside
my phone used in 24h, very good

I'm using juggs. 5.0 with a DSX kernel. I've been getting about 11-12 hours with decent use.
Sent from my SGH-T989 using XDA App

stock rom. Just download a battery manager from the Market.