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I just got a little boost on perf (20% in the best case) with my setting. In 3DMark for example i got 3550 stock and 4119 overclocked (1800-800-798) and env. 20000 in Antutu. For the flash, mine is slow as hell (like than other iFive X2 for example). With cache i got a good speed but when cache is empty is slow again (2-2.5Mb/s ex. for larges files). For the cache a mean SD read ahead cache. The flash is the slowest parts on these tablet with RK3188.
ManuPC for example, provide an overclocked kernel & ROM for iFive X2 @ CPU1700-RAM720-GPU798 for more compatibility.
For reactivity, you need a entropy fixer like "sEFix" include in OMA rom with value 256.
EDIT: i made littles tests. And RAM is really overclocked and had huge inpact on score => Antutu 20000@800 19888@720 18950@Stock .3DMark => 4119@800 3908@720 & 3485@Stock. PS: At 800 is not totaly stable i got ramdom black screen of death this morning, but a 720 it seem stable. These tests are made on 4.2.2 with CPU1800&GPU798
OMA => Is Flash our tablet with bootloader Gen 2 aka 2.10 is useful for us with KitKat. I testing it for test iFive X2 ROM without modification (Don't work) and i revert back to Gen 1 (1.24) bootloader.
1. Personal request for testing purposes - could you pleas make an stock CUBE 1.06 and 1.04 kernels (some people say that 1.04 is faster) and also U39GT-W 1.01 kernel with NO OVERCLOCK of the CPU (315-1600), RAM overclock to 720 and GPU to 700. I will attach the kernels in the post.
2. The OMA build does not work with 2.10 loader. Thats why it is able to work with the kernel that we have currently.
3. I did always used an entropy fixer. Until now i did use SEDfixer.
4. So it seams that the NAND chips-speed/write speeds are the bottleneck for the performance issues and the slowly (as hell some times) real life speed feel. I also think thats why overclocking CPU/RAM?GPU will not gain much performance except in benchmark tools such as Antutu and other. Until we have an kernel that support TRIM there will be almost nothing that we can do.
Off topic. I did own several tablets (1,2,4 core models) and currently I have CUBOT ONE phone. All of those devices have less powerful hardware, but there are working much faster because the NAND speeds ware faster, much faster. It is like having a fast car and driving it slow because of the bad road conditions.
For example my CUBOT ONE phone gets lower ANTUTU scores (much lower 12000 compared to 18000 of CUBE's) but there is no lag at all. When I am copying something to Cubot One I get UP TO 10MB/s and when I am downloading something (like torrents) I get like 4-5 MB/s. While whit the Cube I get 2-2.5 MB/s when copying and 200-300kb/s when downloading torrents.
Ok i'll do it. thank for the kernels :). For the slow nand we don't have any solution :(. The overclocking in my case, is for less paintfull experience in everyday use.
PS: I stabilised my oc to 1800. i forgot to apllicate the correct voltage to RAM 1,275v. it's 1,2v before and 1,275v it's default Cube original kernel. And i've made another test my CPU can't go highter than 1800 even with max voltage 1,45v (no boot)
EDIT: Done !!! See in attachements. 2 versions of 1.04 & 2 versions of 1.06 with CPU Stock and RAM 720. The two version are GPU Stock & GPU 798 because 700 isn't hardcoded in SoC RK3188. Have fun
EDIT2: If anyone provide me an U39GT-W kernel i can mod it if you want.
I've got other tab too 7" allwinner A13, Archos 10" XS an others i sells.
The following users say thank you to primus for this useful post:vasil_d
Hi and thanks for the mods.
I am attaching the U39GT-W 1.01 firmware kernel.
Do the same modifications again pleas. Also I want to ask you did you OVERVOLT the RAM/GPU when you did set the overclock settings?
EDIT1: Tablet boots and works fine with kernel106_cpustock_gpu798h_ddr720.img
EDIT2: DO NOT bother to mod the U39GT-W kernel. I did try the stock and it does not work. No sound, not powering off + other issues.
OC will lead to an instable tab. I cannot recommend that.
Only problem with Rockchip tabs is the badly driver for SD/MMC and NAND.
Has the U39GT-W the same hardware then the U39GT?
- Oma -
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Thanks OMA for the explanations :). The Cube U39GT-W is not totally the same => different sound codec & accelerometer. Many people test this ROM on Normal U39GT and don't got sound, accelerometer & many bugs due to different hardware.
vasil_d => I just apply correct voltage to RAM (same as cube) and yes for the GPU (cube 1,2v@600, this kernel 1,375v@798, the other frequency steps are the same than Cube)
So for the time been there is no hope the RK3188 chips to "behave" good.
We just have to wait for proper written NAND handling driver. Like I did write, I noticed that the problem is the slow read/write speed of the NAND memory which is bottlenecking the systems. Also thats why I do no think that overclock of any kind will help the overall performance.
A bad sign is that the RK3188 was released long time ago and there is still no fix.
EDIT: Take a look at this:
I will work this week on that image.
I will ask Oma7144 for permition to do that.
I know that he has discontinued his work on that exact project (according his XDA profile signature), but it is his initial work.
About the performance. Yes I think It is bit faster. I know it may be placebo effect but... Until there is a proper written NAND (eMMC) handling driver/module and new (not like now 3.0.36+ kernel) there will be not significant speed improvements.
Also there are some bugs to fix like the camera which is not working.
The following users say thank you to vasil_d for this useful post:killain, primus, Jonok, manu_katz
My tablet decided to run out of storage space during download of a large game. It crashed and rebooted but all the apps and data were gone.
So I decided to go ahead and install kit kat. I found my tablet runs a little smoother with the cube kernel.
Seems quite quick and smooth but we'll see how well it performs after installing a few apps.
Thanks Oma and everyone else who contributed.
vasil_d => got any progress for the two camera ? Because, i've made some little tests earlier for the two camera . they're working but inverted 90° clockwise. It's related with the /system/lib/hw files. I can provide them later if you want.
killain => i got large game and don't got this problem. What the large game you want to install ? For the 8gb parameter file ask vasil_d for providing it (if he want/had time to provide it)
Maybe this topic can help to tweak our device:
I have Also increased the Speed if reading / writing in the nand flash by mounting mtd partitions with:
ro noatime nodiratime noauto_da_alloc data=writeback barrier=0 nobh
instead of using an app to mount the android folder in external sd, you can use a terminal emulator, then this command to mount the folder from exterlan sd - internal, so you can play more games! (Note: please do create the /Android/data and /Android/obb on both internal and external SD
$ su mount -o bind /mnt/external_sd/Android /mnt/sdcard/Android
# mount -o bind /mnt/external_sd/Android /mnt/sdcard/Android
to remove the mount/bind
$su umount /mnt/sdcard/Android
# umount /mnt/sdcard/Android
The mount / bind is not permanent though, and you will need to enter the command every restart of the device.
The following users say thank you to dinindourden for this useful post:killain, primus
Hi Primus. Thanks for the reply. I was on the iconbit 4.2.2 jelly bean. There was only 2gb of app space and I installed walking dead. As I was downloading in app content I ran out of space which made the tablet crash and reboot.
I'm on KitKat now but I'm having problems with the internal memory. You know the internal memory gets partitioned into app space and the rest is shown as SD card. The SD card part doesn't mount. Does yours on KitKat? Any ideas on how to solve the problem?
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