Z1 suffers from high i/o wait and kdswap0 - Xperia Z1 Q&A, Help & Troubleshooting

Hello, I am using a z1 C6902 on lollipop 5.1.1. My free ram is about 350 - 500 mb. However i got intensive lag when unlocking the phone or turning on data or wifi or switching between apps . Using showing the cpu stats in developer options, the phones shows that i have the very long blue area. Usually system_server and kdswap0 is the culprit. I tried disabling swap but still has big i/o wait. Does anyone have the same problem?

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[Q] CPU throttling on Revolution

Long time lurker, but 1st time poster.
I've noticed on my Revolution that the CPU always runs at 1ghz. I thought CPU throttling was a standard feature in android?
Anyhow I installed CPU tuner and I get much better standby battery life now (~2% drain/hr when not using phone vs. ~5% drain/hr on standby). The phone runs mostly at 124mhz w the screen off. My problem is my revolution reboots pretty frequently and sometimes even just completely shuts down w CPU tuner on. I still get reboots once in awhile w CPU tuner turned off, but much less frequently.
Anyone else having this problem? I also have green power running in the background to turn off the data connection w the screen off. Are you guys who use setCPU not getting reboots? If so I'll spend the $2 and give that a try.
hadookee said:
Long time lurker, but 1st time poster.
I've noticed on my Revolution that the CPU always runs at 1ghz. I thought CPU throttling was a standard feature in android?
Anyhow I installed CPU tuner and I get much better standby battery life now (~2% drain/hr when not using phone vs. ~5% drain/hr on standby). The phone runs mostly at 124mhz w the screen off. My problem is my revolution reboots pretty frequently and sometimes even just completely shuts down w CPU tuner on. I still get reboots once in awhile w CPU tuner turned off, but much less frequently.
Anyone else having this problem? I also have green power running in the background to turn off the data connection w the screen off. Are you guys who use setCPU not getting reboots? If so I'll spend the $2 and give that a try.
Click to expand...
Click to collapse
I honestly don't think anyone has been messing with the CPU until the CM ROM is released.
hadookee said:
Long time lurker, but 1st time poster.
I've noticed on my Revolution that the CPU always runs at 1ghz. I thought CPU throttling was a standard feature in android?
Anyhow I installed CPU tuner and I get much better standby battery life now (~2% drain/hr when not using phone vs. ~5% drain/hr on standby). The phone runs mostly at 124mhz w the screen off. My problem is my revolution reboots pretty frequently and sometimes even just completely shuts down w CPU tuner on. I still get reboots once in awhile w CPU tuner turned off, but much less frequently.
Anyone else having this problem? I also have green power running in the background to turn off the data connection w the screen off. Are you guys who use setCPU not getting reboots? If so I'll spend the $2 and give that a try.
Click to expand...
Click to collapse
As far as I've seen, the Revo's CPU does automatically speed scale to the necessary load.
If you're running lots of apps in the background, with the screen on Android will keep the cpu at full throttle to provide a smooth experience for you.
As soon as you turn off the screen, it will throttle it down as much as it can.
If the phone's rebooting on you, that's because whatever cpu tuner is doing may be keeping the cpu speed too low for the demand of the OS, then the watchdog kicks in when it thinks the cpu is stuck in a loop. (watchdog wants to be petted every 30 seconds, if the cpu misses that, the watchdog reboots the phone)
I use setcpu and have no reboot issues.
Sent from my VS910 4G using XDA App
throttle
I use android system info to show the CPU speed. It shows the % of time my revolution is running at each speed. W/o using a 3rd party app it always shows 100% at 1Ghz. W CPU tuner running it shows 50% at 122Mhz, 25% at 1Ghz, and 25% in between.
I don't think I'm running any apps thats sucking up a lot of CPU. I'm rooted w most of bloat removed.
Am I the only one not seeing any CPU throttle on stock?
i'm not seeing any throttling on stock.
setcpu drastically improved battery life when the phone's off, and no reboot issues.
some issues initially with the phone not throttling back up quickly enough when i got a call, making me unable to answer the call, but played with the settings and made it so it automatically throttles back up to 1024 when i get a call, and now it's fine.
Exactly Im much happier with my phone now. I had the same issue when I received a call but set up the profile as u did and have no problems at all
newkick said:
i'm not seeing any throttling on stock.
setcpu drastically improved battery life when the phone's off, and no reboot issues.
some issues initially with the phone not throttling back up quickly enough when i got a call, making me unable to answer the call, but played with the settings and made it so it automatically throttles back up to 1024 when i get a call, and now it's fine.
Click to expand...
Click to collapse
Sent from my VS910 4G using XDA App
I am using setCPU as well with no issues. I have mine set were the screen is off it goes to 124 and clocks back up to full 1GHz when it is on. Helps greatly improve my battery.
So what settings do you use? I get really bad lag when waking my Revo. Sometimes it will reboot after waking too.
Sent from my VS910 4G using XDA App
I don't know if this is a CPU throttling issue, or a general REVO issue, but I get horrible horrible lag sometimes trying to get any programs to respond. Like press the home key, or click send, or anything like that. I'm running Decrap 1.1, I don't know if I have too many processes running or what.
Interesting. The Thunderbolt has the same issue. Is it the same CPU in that phone?

[Q] CPU running at high clock most of the time

Updated section:
After clearing cache through recovery and doing a hard reset, the uAh has gone back to 3142000. Standby time seems good with the battery losing 7% overnight. It does charge quite quickly from 0-100 in about 2h. The previous heating issue remains with cpu monitors showing that the cpu jumps to high clock when I touch the screen. I don't see any change in which apps use the most battery with the screen taking up the most as before the problem started.
The heat appears to be what is draining the battery but I can't find any single app that causes it to ramp to max.
Pictures:
No-frills is set to stock settings to see how the phone handles the actions
2nd picture is when phone is idle
3rd picture is immediately after swiping through a few tabs and scrolling through some pages in the app which causes cpu clock and load to increase
Old sectionFor when battery uAh was low)
I've had this Z1 for about 11 months. I can only get around 2.5h on screen time with regular usage. The battery uAh was only 1848000 Recently it fell to the 1700s. Calibration appears to reduce the value further. The phone seems to heat up in about a minute or two no matter what app is running.
The phone is rooted on stock 4.4.2
I have tried updating to Lollipop before but received an error due to rooting, so I don't think anything changed.
bump
alantay11 said:
bump
Click to expand...
Click to collapse
sounds like it's time for you to replace your battery.
You may try to disable the "input boost frequency"
By default when you toch the screen, cpu frequency of two cores instantly jumps to around 1400 to preventing any lag but it seems to use more power and causing heat
I have disables this and since then I'm no longer have any heat issue and also the battery life is so much better now but you may exprience a little lag while scrolling on heavy web pages but thats all
Btw i'm on .157 and using Kernel Adiutor for cpu tweaks
You may disable this by the app mentioned above or by editing sys.somc.touch_perf_kick=1 from 1 to 0 in buid.prop or adding this line

Z3+ High Ram usage on nonrooted Marshmallow .185 ftf

Why the Ram usage is so high with minimum 4 to 5 extra apps installed? Due to that I think the 3gb ram is not sufficient for z3+. Any suggestion to reduce ram usage?
i m also facing problem in z3 plus.. its taking much ram .. there is problem in wireless headphone when its taking so much ram . after restart prob is solve . after 2 days same prob again.. so you should keep restart your phone within 2 days intervals.
I ll downgrade to lollipop. Sometimes I wish someone can cook a jelly bean 4.3 ROM for our z3+.

Suddenly slow device which is getting warm

Hey guys,
my Exynos S10+ is now around 2 weeks old. Since yesterday it suddenly gets warm and is behaving really slow animation-wise. When checking CPU stats with AIDA64 I can see that all 8 cores are running around 1900 (1-4) and 1400 (5-8) Mhz nearly constantly. According to Samsungs Device management only 1 GB of RAM is free however there are "no used apps" and I cant free more RAM.
Anyone else noticed this? :/ I will go through my recent App updates later to see if something might be the culprit.
Is there any way to see which process uses xxx MB of RAM without root?
Thanks
Rob

memory usage

Since the P20 does have 6 GB of memory the usage never seems to exceed ~51%.
Is there a threshold?
Also boost app, after intense use, sometimes crashes and restarts.
So I suspect the real memory usage to be restricted to save battery?
Achilles Etimone said:
Since the P20 does have 6 GB of memory the usage never seems to exceed ~51%.
Is there a threshold?
Also boost app, after intense use, sometimes crashes and restarts.
So I suspect the real memory usage to be restricted to save battery?
Click to expand...
Click to collapse
RAM uses power whether it stores a 1 or a 0 so it's always active. Ram usage won't affect battery life. The os just manages the ram to keep sufficient available for running foreground apps etc and closes or minimises background ones as needed. I've seen mine go as low as 2gb available.
Sent from my CLT-L09 using Tapatalk

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