CFS vs. BFS kernels - EVO 4G Q&A, Help & Troubleshooting

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.
Click to expand...
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

Related

KiNgxKernel or Netarchy kernel?

Which one do you like better? I'm not necessarily looking for best over clock speed, but actually better battery life. Any ideas?
I prefer kings kernels.. I haven't had good results on nets kernels lately.. cpu stayed at 100% a lot for me..
Kings scales just fine for me and provides great battery life.. I use his bfs #4 kernel.
Sent from my HTC Evo 4G using XDA app.
I've used nearly every one of netarchy's kernels, but am now using King's. My battery life is awesome on BFS #4, and everything is very smooth.
I actually prefer hero's baked snack kernel 1. It also has HAVS like king's kernel. Standby time battery life is about the same between king's and hero's, but for me hero's battery life is better when actively using the phone.
Sent from my PC36100 using XDA App
Stupid question, but what is the difference between BFS and CFS kernels?
I guess a better question is BFS #4 or CFS #7?
bigupurself7 said:
Stupid question, but what is the difference between BFS and CFS kernels?
I guess a better question is BFS #4 or CFS #7?
Click to expand...
Click to collapse
exactly my thoughts.. which is better?
WutTheHeezy said:
exactly my thoughts.. which is better?
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Click to collapse
Google is your friend. But basically, BFS is supposed to be faster, while a little less stable, while CFS is supposed to be a little more stable (its older), but the trade off is the speed. I personally dont see much of a speed difference, but I still usually use BFS.
netarchy. Never had any problems with his kernels. Haven't tried King's yet, but the way I look at is, if it ain't broke don't fix it.
Sent from my FROYO'D EVO using xda app
Kings
Sent from my PC36100 using XDA App
running net's kernel atm, but most likely going to switch. 4g doesn't seem to work for me, and it keeps saying there is a voicemail update, but won't actually let me install it.
I'm sure KingxKlick is a great guy and knows what he's doing, but I avoid his kernel because he doesn't actually own an Evo. I stick with netarchy because he's someone I trust.
Last-Chance said:
running net's kernel atm, but most likely going to switch. 4g doesn't seem to work for me, and it keeps saying there is a voicemail update, but won't actually let me install it.
Click to expand...
Click to collapse
Unistall voicemail from Titanium backup. Then go here http://forum.xda-developers.com/showpost.php?p=7749762&postcount=44 That is the updated Apk for the voicemail. Hope that helps man. And for me I use Kingz and love it. Been getting some very good battery life out of it. And its smooth even when running @ 1.17 oc.
Last-Chance said:
running net's kernel atm, but most likely going to switch. 4g doesn't seem to work for me, and it keeps saying there is a voicemail update, but won't actually let me install it.
Click to expand...
Click to collapse
Do you have the latest radios?
The voicemail update (or lack of update, rather) is a ROM issue. It affects Fresh and others. More info and fix here.
sturmen said:
Do you have the latest radios?
The voicemail update (or lack of update, rather) is a ROM issue. It affects Fresh and others. More info and fix here.
Click to expand...
Click to collapse
hmm, thats weird. I didn't have the problem before i flashed it with the kernel. any info on the 4g issue? if thats rom as well, then netarchy kernel is fine.
edit: just did a quick flash of king's kernel. seems like the 4g issue is rom issue as well.
Kings has been amazing so far, i'm very satisfied!
I have used both and get better battery out of kings by a large margin. I am using the BFS #4 and couldn't be happier. I had the 100% CPU issue on nets last update.
Here is a simple thing for me: When I am running Kings, my phone seems cooler to the touch, no matter what I'm doing. On nets, it get warm, then cools, then warm. Heat is wasted energy.
I think lots of the meat and cheese in Kings kernel came from net anyhow, but I no longer has a need to flash a new kernel. Sticking with kings.
-Roger
Like said above, if it isn't broke, I don't fix it. I'm using Netarchy's 4.18 and I'm not having the 100% cpu issue at all
Ok, figured I'd contradict myself and flash king's #4 bfs and test benchmarks against net's 4.1.8 bfs. Here are my results:
Fresh 3.1.0.2 / novatec 0003 / setcpu @ 1152 performance
fps2d:
net's - 54/2.69 attempt 2 of 3
king's - 54/1.84 attempt 3 of 3
linpack:
net's - 37.029 attempt 4 of 5
king's - 37.661 attempt 4 of 5
Nena Mark: Only ran once
net's - 15.7
king's - 15.5
Neocore: Only ran once
net's - 31.4
king's - 31.7
Quadrant:
net's - 1496 attempt 1 of 2
king's - 1513 attempt 2 of 2
Looks like king won this round. Gonna keep running it to see what battery life is like.
Netarchy 4.1.8. Maybe I'll try King's....but Netarchy is always on the ball. My battery is at 26.0 C on Net's and I've been surfing the web.
Will be using net's. It's like Kobe v LeBron
MedSchool26 said:
Netarchy 4.1.8. Maybe I'll try King's....but Netarchy is always on the ball. My battery is at 26.0 C on Net's and I've been surfing the web.
Will be using net's. It's like Kobe v LeBron
Click to expand...
Click to collapse
Lol or Ford vs. Chevy

[Q] Opinions: best sense rom/kernels for battery?

hey guys im sure you get these a lot.
anyway, Ive been running CM6 for awhile now but found out my hometown has 4G coverage now and where i go to school will get 4G in about a month, so I have to make the switch to sense for obvious reasons. Im not huge on performance because frankly i'm not looking to blow minds with benchmarks on quadrant, the phone is fast as **** no matter what so im looking for the best battery life. a must for me is that they keep the theme relatively stock as well, some people arent graphically inclined no offense...
also looking for a good stable kernel with good battery life.
currently running burnt droid with baked kernel #6. heard fresh was good on battery but i think his site, geekfor.me, is down, can someone confirm this?
thanks a lot for your opinions
I don't have 4G here, so I can't say for sure how much 4G affects the battery on this rom, however I've been using Ava-FroyoV10. I do know that the 4G works. I have used it once while I was traveling through a few towns that did have it.
Besides 4G, I do use my phone pretty averagely. In my opinion anyway. I'm usually constantly texting, checking up on eBay using their app, having it plugged into the radio in my car for music, or reading up on engadget. Using Wifi or 3G were applicable. My phone lasts from, about... 8:30AM to around 9 or 10PM. I get a good day's use out of it with Ava-FroyoV10.
I don't use any kernel. I did used to have Netarchy's, however the Ava's stock kernel feels better with the phone. You do not get to adjust your CPU Voltage with the stock kernel.
Your best bet is to surf the Roms and Kernels. Find which one you like best, and stick with it.
Myns warm works pretty well for me with the stock kernel.
plus its a damn good looking rom
mic.mayorga said:
hey guys im sure you get these a lot.
anyway, Ive been running CM6 for awhile now but found out my hometown has 4G coverage now and where i go to school will get 4G in about a month, so I have to make the switch to sense for obvious reasons. Im not huge on performance because frankly i'm not looking to blow minds with benchmarks on quadrant, the phone is fast as **** no matter what so im looking for the best battery life. a must for me is that they keep the theme relatively stock as well, some people arent graphically inclined no offense...
also looking for a good stable kernel with good battery life.
currently running burnt droid with baked kernel #6. heard fresh was good on battery but i think his site, geekfor.me, is down, can someone confirm this?
thanks a lot for your opinions
Click to expand...
Click to collapse
Try myns rls 4 with its stock kernel or net 4.2 cfs bfs move havs smartass they both work great for me and a lot others
Sent from my PC36100 using XDA App
terrel_b said:
Myns warm works pretty well for me with the stock kernel.
plus its a damn good looking rom
Click to expand...
Click to collapse
Lol I didn't see your post +1
Sent from my PC36100 using XDA App
I too am looking for suggestions on a good rom to use to have decent battery life. Is Myn the only rom? What other kernels have decent battery life?
+1 I only get like 12hours max when i hardly use my phone... battery is going downhill

Best AOSP Rom For Battery Life

I'm currently running Cyanogenmod, but I listen to music at least a few hours a day, and its really draining my battery. Any suggestions for a good AOSP rom for battery life, outside of MIUI and Cyanogenmod? Thanks!
Try the new savaged Zen kernel..
SENT FROM THE BATHROOM AT WORK...
ImEVO said:
Try the new savaged Zen kernel..
SENT FROM THE BATHROOM AT WORK...
Click to expand...
Click to collapse
do not use the 1.0.0 kernel or you will get nasty audio quality if volume is > 50%
SZ 0.2.1 is getting me a lot of battery life. there is salvage mod 1.1 as well
I haven't done a whole lot of kernel flashing before, SZ is compatible with Cyanogenmod I take it?
Are you looking for Rome or kernels?....cus Tom's I wouldn't know but the tiamat kernel in my sig for AOSP roms works really well...SBC and non-SBC available
Sent from my nightly EVO
I am getting REALLY good results with CM7 and Tiamat. I don't do a ton of music listening but I do put medium to heavy use on it and I am nowhere near having to charge it end of day.
Thanks guys, I'm gonna try out tiamat then!
Beast, I see you're using SBC, how about you blizzard? I'm a little concerned to try the SBC one.
If you're using pandora, slacker, or some other music streaming app your battery will suffer pretty much regardless of whatever kernel you're using.
Sent from my hand with XDA Premium installed
SavagedZen is he best for ASOP in my experience, but anyone can have great battery life just by turning off data/WiFi, etc when you aren't using it.
thanamesjames said:
Thanks guys, I'm gonna try out tiamat then!
Beast, I see you're using SBC, how about you blizzard? I'm a little concerned to try the SBC one.
Click to expand...
Click to collapse
I am on the nonsbc one, I usually disregard the warnings as I am fairly comfortable in flashing and such but when it states actual damage possible that's where I stop.
That's just me though, some people seem to have great success with it.
If you do a little research, the 8 reports of damage from sbc kernels came from the very early days of sbc development.
It's all I use and I haven't had a problem.
Maybe I'm just lucky
HipKat said:
If you do a little research, the 8 reports of damage from sbc kernels came from the very early days of sbc development.
It's all I use and I haven't had a problem.
Maybe I'm just lucky
Click to expand...
Click to collapse
Yea don't get me wrong, I know they are probably safe to use or the devs wouldn't put them out as final builds. I just personally don't use them.
Visit HERE. Also, I've been using sbc since they first arrived on the seen. I've yet to have any problems so I suppose everyone is different.
I run this rom, http://forum.ppcgeeks.com/cdma-htc-...rom-gingerbread-evo-deck-rc6-real-stable.html
And this kernel, http://mirror.savaged-zen.com/
with great results.

[Q] kernals

currently running koni elite 3 and love it...was just wondering is there a kernal out there that makes this rom even faster? dont get me wrong this is way fast just wondering if it can go faster
thanks
justintammy said:
currently running koni elite 3 and love it...was just wondering is there a kernal out there that makes this rom even faster? dont get me wrong this is way fast just wondering if it can go faster
thanks
Click to expand...
Click to collapse
Netarchy's & Ziggy's kernels. Take your pick, for faster, id say bfs
blakeboys said:
Take your pick, for faster, id say bfs
Click to expand...
Click to collapse
Just to expand a little on this.
Every kernel will work differently on every EVO, small variables in the manufacturing produce a wide array of possible configurations. Try a few and decide for yourself.
Net's kernels tend to favor stability over speed.
Ziggy's tend to favor speed over stability.
CFS favors the performance of the EVO as a whole (multitasking) and will have consistent, smooth performance across the board.
BFS favors performance of the apps in the foreground, so game performance will be better, but multitasking might be laggy at times.
Good luck!
...yes try the newer NET kernels (beta) its said to be even faster! and check out the kernel guide in there. http://forum.xda-developers.com/showthread.php?t=719763
Thank you guys
Sent from my PC36100 using XDA App
mexlos said:
Just to expand a little on this.
Every kernel will work differently on every EVO, small variables in the manufacturing produce a wide array of possible configurations. Try a few and decide for yourself.
Net's kernels tend to favor stability over speed.
Ziggy's tend to favor speed over stability.
CFS favors the performance of the EVO as a whole (multitasking) and will have consistent, smooth performance across the board.
BFS favors performance of the apps in the foreground, so game performance will be better, but multitasking might be laggy at times.
Good luck!
Click to expand...
Click to collapse
Finally a good explanation
one more thing guys, what does sbc mean? again thanks for the help
umm nevermind

[AOSP] Q Which kernel do you prefer? Savaged Zen or Tiamat?

Just a show of hands basically, because both of these guys keep updating their kernels back to back it seems.
I personally use tiamat 3.3.3, these kernels have been good on my battery, and are pretty fast.
Which do you prefer?
Sent from my PC36100 using XDA Premium App
-Raises hand for Tiamat-
phonetec said:
Just a show of hands basically, because both of these guys keep updating their kernels back to back it seems.
I personally use tiamat 3.3.3, these kernels have been good on my battery, and are pretty fast.
Which do you prefer?
Sent from my PC36100 using XDA Premium App
Click to expand...
Click to collapse
I agree Tiamat has been awesome for me...i had too much chopiness with salvaged-zen and i personally like the SBC addition to kernels and they stopped updating it with SBC i saw...but as far as battery life and smoothness goes, i choose Tiamat, hands down.
Tiamat is great, but there is something up with bluetooth audio in his kernels. It's like the audio doesn't use the mic to auto cancel sound or something. Can't really put my finger on it. All I know is that when talking to the fiance after work on the way home in the car on yesterday, all she heard was road noise. Switched back to SZ and today its gone. Gonna wait a couple of revisions and try it again
teh roxxorz said:
-Raises hand for Tiamat-
Click to expand...
Click to collapse
MEGA dot. 3.3.3 ia ftw
Sent from HTC EVO
Savaged Zen here. I tried Tiamat for a while, but I kept getting random reboots no matter what I tried. The first SZ I used was .9 bfs havs, and it worked great. Currently on .1.2 cfs and no problems.
Savaged Zen All the way. Especially now (this is from march) the 2.6.38 line, im on the newest 2.0.2 and Its super smooth, I havent seen the slightest hint of any instability, and it rips on benchmarks and games
Any Tiamat kernel sends me into random soft reboots, almost once every half hour or so. I can get it to stop by flashing ViperBoy's raise voltage script. Then it runs quite smooth and stable, however battery life sucks for me (probably from raising voltage) Savaged Zen gets my vote, it just agrees with my device way better for some reason, especially 2.0 CFS.
SavagedZen works better for me than Tiamat. Had them both and both worked well but I like running BFS on my phone and the SavagedZen governor is a great governor for battery life and performance.
timat is really stable on my phone, but sz has always been much faster... now that he new sz fixed my problems, im staying with it
I'm a fan of savaged but I'm cool with tiamat, still looking for a happy home. Im on SZ 2.0.2 which is giving me good battery life but still has the BS wimax bug. I ran tiamat a couple weeks ago for a few days but I swapped out once the random reboots started. Wish CM7, one of the best roms, also came with the best kernel.
Sent from the moon, Alice says hi.

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