Develop Bugs

CFS vs. BFS kernels

I've been looking around at new kernels (the one I have now is murdering my battery).
What is the difference in CFS and BFS kernels?
I know that it has to do with the scheduler, but what are the pros and cons of each in terms of the Evo?
Thanks, guys.

Your best bet is to try them out. It can be subjective, depend on usage, and differant bugs depending on release. This compounds individual bias as few can say they've tried them all.
Sent from my PC36100 using XDA App

SharkUW said:
Your best bet is to try them out. It can be subjective, depend on usage, and differant bugs depending on release. This compounds individual bias as few can say they've tried them all.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
+1
You've got try them out for yourself. Not all EVOs are created equal.
Sent from my PC36100 using XDA App

After reading this (mainly the conclusion), I went with BFS.
http://www.cs.unm.edu/~eschulte/data/bfs-v-cfs_groves-knockel-schulte.pdf

I wasn't sure if there was a consensus about which is better. That's why I was asking.
Off to try new kernels...
Thanks, guys.

I just saw your ISP. Clemson?
Get ready for a beating on 10/23 when you play GT.
Good luck with the kernels.

ckombo said:
I just saw your ISP. Clemson?
Get ready for a beating on 10/23 when you play GT.
Good luck with the kernels.
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Click to collapse
Maryland gonna whoop both y'all!!!
lol sike
bfs... performance it better. still a lil buggy on the phones but works good for me. as the .34 kernal becomes more developed it should get much better

Yeah, yeah. Spot the * ball.
Haha.
Football season is here, boys. Get ready.
Thanks Terp and Wreck.

Amen to trying them out. I have been largely happy with the CM6 stock kernel but a 3D game (Dungeon Defenders) was getting a little choppy; I was feeling saucy the other night and decided to experiement with kernels with the express purpose of improving 3D game play. After reading around this site and others, I was sure I would end up using a BFS kernel of some sort as that - at least according to my tiny brain - seemed ideal for a single, resource intense process. I flashed the SnapTurbo 7.6 BFS and it actually made the game worse! The Evo was otherwise quite snappy. I flashed the ST 7.6 CFS thereafter and actually enjoyed the marginal benefit in the game I had hoped for.
So, again, just try it! Much luck

http://forum.xda-developers.com/showthread.php?t=894880 You're welcome.
Personally, I prefer CFS, works for me quite nicely.

I find the phone feels a little snappier on a BFS kernel, and tends to score higher in the benchmarks using the same CPU frequencies/voltages and governor...but the CFS kernel usually has better battery life and seems to be more stable.

Cfs or bfs kernel
ckombo said:
I just saw your ISP. Clemson?
Get ready for a beating on 10/23 when you play GT.
Good luck with the kernels.
Click to expand...
Click to collapse
I think CFS is a far more stable version than the BFS and its quite well refined, Iam using Francos 19.2 kernel

[Q] how do I improve benchmark scores?

My benchmark scores are terrible, just short of 1100. According to the benchmark app, quadrant, I am very under average compared to most Evos. What are some mode, roms, hacks, etc that I can run to get back to at least average, if not higher? I'm currently trying out Mik Z and I typically run either MikFroyo or Konikub's Elite Series II.

I know that those numbers look great when they are high, but the real test is...does your phone feel fast? Dont put too much faith in those benchmarks, your eyes, and hands will tell you if your phone is fast or not. Cheers!

Semantics said:
I know that those numbers look great when they are high, but the real test is...does your phone feel fast? Dont put too much faith in those benchmarks, your eyes, and hands will tell you if your phone is fast or not. Cheers!
Click to expand...
Click to collapse
The phone works perfectly on every rom I've used except CM7 (I used the wimax alpha, so it wasn't perfect for me). Very fast, iPhone fast even. However, I know that our UI is processor based and not graphics based (so our Adreno 200 doesn't have to process the home screens and such). This is strictly because I've seen Evos run 1700s and I'd like to try to get it.

Most of the roms that run 1300 and above are aosp roms. And it also depends on overclock speed and and kernel. it isn't just about choosing the right rom but the right combination of rom kernel and clock speed. it is basically trial and error. This website was started by skydeaner and it is a review of several different roms and kernels. It is a good website for the information that you want and can help minimize the amount of trial and error. hope this helped
http://home.comcast.net/~evoreviews/

caguirr4 said:
Most of the roms that run 1300 and above are aosp roms. And it also depends on overclock speed and and kernel. it isn't just about choosing the right rom but the right combination of rom kernel and clock speed. it is basically trial and error. This website was started by skydeaner and it is a review of several different roms and kernels. It is a good website for the information that you want and can help minimize the amount of trial and error. hope this helped
http://home.comcast.net/~evoreviews/
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Click to collapse
well you also have to keep in mind every phone is going to act different. Some phones can over clock much higher than others. Some kernals play well with one phone, and terrible with another.
So you could exactly match my setup, overclocked exactly the same, everything, and yet one phone or the other is going to almost always be faster.
I know my phone doesn't seem to have issues one way or another betweem BFS and CFS kernals, but some people I know, and I've seen people say it on here, their phones really only handle one or the other very well.
but as the other guy said, if you want fast speeds, dump the sense roms, AOSP, specially GB is going to be much faster.

Gb is fast. Cm7 with savagedzen cfs at 1190mhz averages 1500-1700 I have gotten 1400 with mikfroyo 4.5 and netarchy 4.3.2 cfs more have.
Sent from my (insert daily ROM name here) Evo 4g

nosympathy said:
well you also have to keep in mind every phone is going to act different. Some phones can over clock much higher than others. Some kernals play well with one phone, and terrible with another.
So you could exactly match my setup, overclocked exactly the same, everything, and yet one phone or the other is going to almost always be faster.
I know my phone doesn't seem to have issues one way or another betweem BFS and CFS kernals, but some people I know, and I've seen people say it on here, their phones really only handle one or the other very well.
but as the other guy said, if you want fast speeds, dump the sense roms, AOSP, specially GB is going to be much faster.
Click to expand...
Click to collapse
Yup that is very true. I agree with you in every word that you just said. Especially about dumping sense and picking up aosp
Sent from my dark WiMax infested CM7 Super...Mario...Saiyen...Street Fighter...oh yeah SuperSonic.

[Q] what is a kernel?

I know this is a really noob question, but what is a kernel? I see them all over the developer section when i look for roms, but i have no clue what it is (sorry if this is a bumped thread).

I also wanna know cuz i would like to use the right kernel to my incredible....
Sent from my Incredible using XDA App

A kernel is the bridge between the hardware (for example processor, memory, nand) and the software (the ROM). This is why changing the kernel can have such a huge impact on battery or speed. For example, one kernel can tell the processor to work its butt off, which decreases battery, while another will tell the processor to relax, increasing the battery life but decreasing speed. Since every processor is made from different silicon, not every kernel fits all phones.
Also, in kernels another important thing is the task scheduler. The Brain **** Scheduler (BFS) basically has ups and downs in performance but the Completely Fair Schedulare (CFS) is pretty much consistent in performance. It's hard to explain. I personally prefer BFS over CFS. Also, if you want higher quadrant scores, use BFS.
Hope this helps.

Thank you so much!

AOSP or Sense - it matters to the kernel
Noteworthy when flashing a kernel -
AOSP ROMs require AOSP kernels, Sense requires Sense kernels.
Same story with Froyo or Gingerbread ROMs, either AOSP or Sense.
Bootloops happen when they get mixed.

Great explanation, thanks- I was too embarrassed to ask, so I used the search...and here it was! finally I have a clue

smtom said:
Noteworthy when flashing a kernel -
AOSP ROMs require AOSP kernels, Sense requires Sense kernels.
Same story with Froyo or Gingerbread ROMs, either AOSP or Sense.
Bootloops happen when they get mixed.
Click to expand...
Click to collapse
Except that i have used ziggys latest bfs wo havs on cm7 an z roms
Sent from my ADR6300 using XDA App

[Q] suggestions on kernel for speed and performance?

hey guys. i'm trying to find the kernel review thread with no luck.
I switched roms (i'm on MetroPCS so using the latest MetroDroid rom) and Im finding the kernel slow. I use setcpu profiles and I notice a slight delay in response that wasn't there before.
I also benchmarked using Quadrant and setcpu set to performance at 1190/1190 and got 1083! much lower than any score i've had in the past.
what's the newest and greatest sense kernel for improved speed and performance? I have the seidio battery and always near a charger, so i'm looking for snappy performance over squeezing 15 minutes more out of the battery.
thanks!
P.S. this is a Sense-rom but 90% de-Sensed. I just prefer the look and feel of Sense after I modify my way over others.

Ziggy's (ziggy471.com) always run faster than Netarchy's for me, but you're going to have to try a few for yourself as every phone reacts differently to diff kernels.

Netarchy's Kernels & Ziggy's Kernels

nets out with his 4.3.4 and has hdmwin built in also has the kernel guide in there.
http://forum.xda-developers.com/showthread.php?t=719763

Help with FPS and scrolling laginess, TIPS?

Hello all. I wanted to see if tips could be posted on how to increase scrolling laginess and increase fps in things like video and games. I bought my wife the shift and Ive noticed its alot better at mobile gaiming and video playback/recording.
Ive rooted and installed myns warm two point two along with netarchy-toastmod 4.3.4 cfs havs more nosbc.
Ive overclocked to 1.2ghz using setcpu and left the governor on smartass. (no profiles)
These seem to have made a visual improvement, but I want/need more.
So my questionis are...
Is there specific kernels that will help get the results Im looking for? (Im more insterested in performace, but would like batterly life is possible)
Are there any hidden tips that can be done via command line etc that will change things to allow for a better fps performance?
ANy help, links, etc will be appreciated. Ive been searching for weeks already just to get myself rooted/romed/kerneled.

The Shift has a better processor and a better GPU. I don't think you're going to be able to match it by overclocking. There are ROMs that tend to be a little smoother than others (MikFroyo 4.6 is nice), but there's only so much that can be done with the hardware. The Evo itself is almost a year old, and the QSD8650 SoC it uses has been available since Q4 2008.

sinnedone said:
Hello all. I wanted to see if tips could be posted on how to increase scrolling laginess and increase fps in things like video and games. I bought my wife the shift and Ive noticed its alot better at mobile gaiming and video playback/recording.
Ive rooted and installed myns warm two point two along with netarchy-toastmod 4.3.4 cfs havs more nosbc.
Ive overclocked to 1.2ghz using setcpu and left the governor on smartass. (no profiles)
These seem to have made a visual improvement, but I want/need more.
So my questionis are...
Is there specific kernels that will help get the results Im looking for? (Im more insterested in performace, but would like batterly life is possible)
Are there any hidden tips that can be done via command line etc that will change things to allow for a better fps performance?
ANy help, links, etc will be appreciated. Ive been searching for weeks already just to get myself rooted/romed/kerneled.
Click to expand...
Click to collapse
As bkrodgers said, the Shift has better hardware than the Evo. My roomate has one, and that thing really is smooth, even on the stock rom. It nailed like 1400 or something like that on quadrant, not even overclocked on a stock rom. The only changes I ever make to my phone that affects the scrolling is the kernel. My phone doesn't like havs, the voltage scaling makes it unstable, and it lags severely, on any havs kernel. I get the smoothest experience out of my device from a kernel that has no havs and isn't undervolted. Of course, you get bettery battery life out of a kernel with havs, if your phone can tolerate it. Every phone acts differently on different kernels, which is why there are so many to choose from. So you can find the one that's 'just right' on your device. It takes a little playing around and kernel swapping to find the right combo. And as far as I know, basically all the kernels that have been available for a good number of months now, have the fps fix already baked in. When the Evo's first came out, FPS was capped at 30fps. Since then, all the custom kernels allow for it to go much higher than that, sometimes up to 60fps. I don't believe there's much more you can do with that.
Also, for what it's worth, you might want to try out an AOSP rom. They have much less crap in them, and they tend to run very very smooth (in my experiences). Not to talk down on any sense rom, as I also love sense, and 99% of the time and more than happy on whatever sense rom I happen to be running at the time. Fortunately, the Evo has quite a few selections on roms and kernels, so there is quite a bit of playing around and tweaking you can do, in search of the perfect setup.

thanks I'll probably try miks rom to see how that goes.
I understand about the hardware and that the shift has a better cpu, but is there anything else other than what I have already done to make everything nice and speedy UI wise? I think the biggest culprit is the app drawer being clunky. (like this on the shift as well) No settings in linux that can help there?
Oh and kernels. Ive tried 2 of netarchy-toastmods kernels and havent really noticed a difference. Both have had havs. Should I stay away from these type of kernels to get better visual performance?
ANy other tips on which kernels youve tried and noticed better ui results?
ah yes the elections are great. lol I guess I'll have to try a non havs kernel to see how they perform along with the senseless roms.
Thanks all

sinnedone said:
thanks I'll probably try miks rom to see how that goes.
I understand about the hardware and that the shift has a better cpu, but is there anything else other than what I have already done to make everything nice and speedy UI wise? I think the biggest culprit is the app drawer being clunky. (like this on the shift as well) No settings in linux that can help there?
Oh and kernels. Ive tried 2 of netarchy-toastmods kernels and havent really noticed a difference. Both have had havs. Should I stay away from these type of kernels to get better visual performance?
ANy other tips on which kernels youve tried and noticed better ui results?
ah yes the elections are great. lol I guess I'll have to try a non havs kernel to see how they perform along with the senseless roms.
Thanks all
Click to expand...
Click to collapse
You're welcome. Just bear in mind, that if you do try out an AOSP rom, that they have different kernels to use. You must use a kernel that was made for AOSP on an AOSP rom. So don't go trying a netarchy kernel on an AOSP rom
Also, I didn't have as good a luck with net's 4.3.4 kernel's as I did on the 4.2.2 or 4.3.2. Also the 4.1.9 kernel's worked great for me. For some reason, the newest one's don't give me the best performance.
As far as tweaking things using ADB, I don't think there's anything you can do FPS related. I believe there are ways to adjust the undervolting in a kernel, using adb, and things like that. But as far as I know, the FPS is what it is at this point, although it will vary from kernel to kernel.