topic Re: Nougat upgrade lowered cpuclock??! in X Series

Nougat upgrade lowered cpuclock??!

doriandiaconu — Wed, 21 Dec 2016 17:14:22 GMT

I'm willing to buy the X Compact in a couple of days, but I saw something interesting online. Can someone look into this? A Sony representative especially.

"So I upgraded my X compact to official Nougat 7.0 a couple of days back and on first impressions I noticed some lag here and there mostly when scrolling
And I knew that Snapdragon 650 is almost clos to SD810 so what could be the problem because it was awesomely fluid and smooth on MM 6.0.1, so I started to dig up and here's what I noticed:

In CPUz app on MM it shows Qualcomm SD 650 @ 1.8 GHz but today I looked it up and in Nougat it shows Qualcomm SD 650 @ 1.4 GHz!!! And if you look at cpu cores, those 2 last core Cpu4 and cpu5 are stopped (i guess those two are A72@1.8GHz cores right?)
So conclusion is that A72 cores which are the main core to maintain smoothness are offline for some reason so Im asking developers to dig this up and help us out
Thank you"

Re: Nougat upgrade lowered cpuclock??!

Uliwooly — Wed, 21 Dec 2016 20:20:20 GMT

@doriandiaconu

could you post the source link of that info?

Re: Nougat upgrade lowered cpuclock??!

Crazy_gump — Wed, 21 Dec 2016 20:32:43 GMT

They are not disabled at the boot but it sure happens after I let the screen off

Seeing this with cpu-Z and some cpu stress app

Re: Nougat upgrade lowered cpuclock??!

doriandiaconu — Wed, 21 Dec 2016 20:34:18 GMT

Didn't know if I was allowed to post external links.

Here is the link. A lot of people complaining about it:

http://forum.xda-developers.com/x-compact/help/nougat-upgrade-lowered-cpuclock-t3522240

Re: Nougat upgrade lowered cpuclock??!

Uliwooly — Wed, 21 Dec 2016 20:35:05 GMT

@doriandiaconu

I'll see if I can get info on this.

Re: Nougat upgrade lowered cpuclock??!

doriandiaconu — Wed, 21 Dec 2016 20:41:25 GMT

Thanks! I'll be waiting for an answer before buying anything.

Re: Nougat upgrade lowered cpuclock??!

Lord_viridis — Wed, 21 Dec 2016 20:47:59 GMT

Tbh, I can't see a lot of people complaining about it, I see two people contradicting the majority that are showing faster results from nougat
Some even bring up the possibility of the app miss reading an idle flag as DISABLED.

Re: Nougat upgrade lowered cpuclock??!

doriandiaconu — Wed, 21 Dec 2016 20:53:32 GMT

Even though, they find it faster (posibility of Placebo), there's no deny that the last 2 cores are off while analysing it. I don't think there's a problem to ask, check about it.

The thread is pretty active taking into account that it was opened yesterday, not many people upgraded to Nougat and not many know about the technical stuff.

I asked here just to clarify it.

Re: Nougat upgrade lowered cpuclock??!

Crazy_gump — Wed, 21 Dec 2016 21:25:36 GMT

Test it some times, these A72 core's stop happened after the screen was shut off one time even if it just a short time. Before this they seems to never going at more than 1200MHz after the phone have totally boot

However for example in antuntu, I could see that there was some purcentage behind these apparently shutted core.

I don't have a bad experience of lag while I'm not scrolling at full speed in an app which wasn't already open.
That's was my little night test, hope the issue or just misunderstanding will be cleared soon.

Re: Nougat upgrade lowered cpuclock??!

Kianush — Thu, 22 Dec 2016 07:14:10 GMT

Hey guys, Im the OP in xda thread
Look I paid 450$ for a 100% smooth phone not even 95% and it was actually like that on MM but not on Nougat, So I know that those lags that I see are not big and maybe you wont even see them but they are happening
Today I tried rebooting the phone and yeah after reboot and before screen off CPUz shows those cores working but those lags in heavy games and some apps that I see are still present, Soo maybe its just that Nougat is not completly optimized for SD650, right?!

Re: Nougat upgrade lowered cpuclock??!

Michelasso — Thu, 29 Dec 2016 09:10:52 GMT

All cores are active. "busybox mpstat" shows activity for all of them:

F5321:/data/local/tmp $ ./busybox mpstat -P ALL                                
Linux 3.10.84-perf-g3245575 (localhost)	12/29/16	_aarch64_	(6 CPU)

09:04:28     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest   %idle
09:04:28     all   15.69    1.39    7.31    0.39    0.00    0.32    0.00    0.00   74.90
09:04:28       0   17.66    1.51   11.69    0.70    0.00    0.53    0.00    0.00   67.91
09:04:28       1   19.56    1.67    7.43    0.43    0.00    0.24    0.00    0.00   70.67
09:04:28       2   13.61    1.26    5.14    0.28    0.00    0.31    0.00    0.00   79.39
09:04:28       3    8.94    1.08    4.06    0.27    0.00    0.16    0.00    0.00   85.48
09:04:28       4   27.12    1.36   12.36    0.02    0.00    0.12    0.00    0.00   59.02
09:04:28       5   24.53    1.56    9.27    0.01    0.00    0.93    0.00    0.00   63.69

So the bug must be in those monitoring apps in Nougat. The cores 4&5 are up and running!

Re: Nougat upgrade lowered cpuclock??!

adamlee2014 — Thu, 29 Dec 2016 18:19:47 GMT

Exactly the same on my Xperia XZ running nougat, restarting the phone makes all cores run again at maximum speed but as soon as you turn off the display it stops 2 cores permanently

Re: Nougat upgrade lowered cpuclock??!

SOUNI1 — Fri, 30 Dec 2016 10:23:06 GMT

Same here look at CPU-Z after updating to Nougat...

Re: Nougat upgrade lowered cpuclock??!

Prince13 — Fri, 30 Dec 2016 16:04:53 GMT

As usual, I'm already regretting updating after half a day...

Re: Nougat upgrade lowered cpuclock??!

Crazy_gump — Fri, 30 Dec 2016 16:46:52 GMT

As said two post berfore, this isn't true.

The A72 core are active but wrongly shown as stopped. No problem with bench or games except some which have problem with nougat in general.

Re: Nougat upgrade lowered cpuclock??!

SOUNI1 — Fri, 30 Dec 2016 18:53:54 GMT

It's True when u restart your Phone all cores works but when u turn screen off 2 Cortex-A72 cores Will be off... I perform factory reset and nothing Change...

Re: Nougat upgrade lowered cpuclock??!

adamlee2014 — Fri, 30 Dec 2016 21:24:49 GMT

Same on my Xperia XZ!!!!!

Re: Nougat upgrade lowered cpuclock??!

Lord_viridis — Fri, 30 Dec 2016 21:56:18 GMT

There is nothing wrong with the phones, the problem lies with the poor implementation of nougat coding in their apps.
Download multi core monitor from Google play and you'll see the cores all working fine.

Re: Nougat upgrade lowered cpuclock??!

Lord_viridis — Fri, 30 Dec 2016 22:04:04 GMT

https://play.google.com/store/apps/details?id=com.mediatek.multicoreobserver

Re: Nougat upgrade lowered cpuclock??!

SOUNI1 — Sat, 31 Dec 2016 09:14:28 GMT

Hmmm... All cores working now