[ivota]

I prepare Pi2 to overclock ( put heatsink and put cooler )

I tried this profile, but system freezes :
arm_freq=1100
over_voltage=4
gpu_freq=500
sdram_freq=500


According this link (http://linuxonflash.blogspot.dk/2015/02/...mance.html) I set:
1100 4 550 483 0 0 0 OK (multi-test) 944 1549 1.951s

arm_freq=1100
over_voltage=4
core_freq=550
sdram_freq=483
over_voltage_sdram_p=0
over_voltage_sdram_i=0
over_voltage_sdram_c=0
gpu_mem=256

It seems ok, for now thes is no problem with OC.
But,there is not set gpu_freq?
gpu_freq=

So What is gpu_freq If is not set in config.
Thanks

[popcornmix]

So What is gpu_freq If is not set in config.

http://forum.kodi.tv/showthread.php?tid=...pid2060374

[ivota]

thank you @popcornmix

I just used @Milhouse config.
I remove cooler from my Pi2 ( too loud, noise, temp was 40C), now my Pi2 only have two heatsinks. Temp is around 58 C.

Code:

gpu_mem=320

arm_freq=1000
core_freq=500
over_voltage=4
force_turbo=1

gpu_freq=400
v3d_freq=300
avoid_pwm_pll=1

It seems good for me.

Here is bcmstat log.

Code:

OpenELEC:~ # bcmstat.sh
  Config: v0.2.2, args "", priority lowest (+19)
     CPU: 4 x ARMv7 cores available, using ondemand governor
  Memory: 1008MB (split 752MB ARM, 256MB GPU)
HW Block: |   ARM   |  Core  |  H264  |    SDRAM    |
Min Freq: | 1000MHz | 500MHz |   0MHz |    450MHz   |
Max Freq: | 1000MHz | 500MHz | 250MHz |    450MHz   |
Voltages: |        +4, 1.3940V        |  0, 1.2000V |
   Other: temp_limit=85, force_turbo=1, avoid_pwm_pll=1
Firmware: Jul 24 2015 14:44:13, version 0f482c5017ad4526a6beb77fe39c93189c664fd4 (clean) (release)
  Codecs: H264 WVC1 MPG2 VP8 VORBIS MJPG
  Booted: Sun Jul 26 08:37:09 2015

Time         ARM    Core    H264 Core Temp (Max)  IRQ/s     RX B/s     TX B/s
======== ======= ======= ======= =============== ====== ========== ==========
09:05:51 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)    658          0          0
09:05:53  999Mhz  500Mhz  400Mhz 57.84C (57.84C)    913          0          0
09:05:55 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)    994          0          0
09:05:57 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)    960          0          0
09:05:59 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)    971          0          0
09:06:01 1000Mhz  500Mhz  399Mhz 57.30C (57.84C)    911          0          0
09:06:03 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,016          0          0
09:06:05 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)  1,170          0          0
09:06:07 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)  1,037          0          0
09:06:09  999Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,068          0          0
09:06:11 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)    997          0          0
09:06:13 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,088          0          0
09:06:15 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,183          0          0
09:06:17 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)  1,236          0          0
09:06:19 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,245          0          0
09:06:21 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)  1,301          0          0
09:06:23 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)    991          0          0
09:06:25 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)  1,148          0          0
09:06:28 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,093          0          0
09:06:30 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,145          0          0
09:06:32 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,064          0          0
09:06:34 1000Mhz  500Mhz  399Mhz 57.84C (57.84C)  1,176          0          0
09:06:36 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,120          0          0
09:06:38 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)  1,021          0          0
09:06:40 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,063          0          0
09:06:42 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,067          0          0
09:06:44 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)  1,053          0          0
09:06:46 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)  1,231          0          0
09:06:48 1000Mhz  500Mhz  400Mhz 57.30C (57.84C)    994          0          0
09:06:50 1000Mhz  500Mhz  400Mhz 57.84C (57.84C)    970          0          0^C
Peak Values: IRQ: 1301, RX: 0, TX: 0

[ivota]

Code:

gpu_mem=320

Code:

Memory: 1008MB (split 752MB ARM, 256MB GPU)

Is this OK, 256MB GPU?

[Milhouse]

Code:

gpu_mem=320

Code:

Memory: 1008MB (split 752MB ARM, 256MB GPU)

Is this OK, 256MB GPU?

bcmstat determines the GPU memory allocation from "vcgencmd get_mem gpu" so you must have another gpu_mem/gpu_mem_1024 setting in your config.txt that is overriding gpu_mem=320. The file is processed top-to-bottom so any later setting will be the one that is ultimately used.

[Warez]

Mlhouse to you see.... the sdram 450 as default.. and not 400? (pi2)

[ivota]

Here is small part of config.txt

Code:

################################################################################
# Memory (System/GPU configuration )
################################################################################

# default GPU memory split (do not change if you do not know what you are doing)
  gpu_mem=128  --------> Do I have this set 320

# SDRAM size based GPU memory split, uncomment and setup to override 'gpu_mem'
  gpu_mem_256=112
  gpu_mem_512=160
  gpu_mem_1024=256 -----> what I need set here? 320?

Thanks

[Milhouse]

Mlhouse to you see.... the sdram 450 as default.. and not 400? (pi2)

The default sdram_freq on a Pi1 is 400.

The default sdram_freq on a Pi2 is 450.

[Milhouse]

Here is small part of config.txt

Set either gpu_mem OR gpu_mem_1024, but don't set both otherwise the last value set will be used (in your case, gpu_mem_1024).

[ivota]

Thank you @Milhouse

Now is OK

Code:

OpenELEC:~ # bcmstat.sh
  Config: v0.2.2, args "", priority lowest (+19)
     CPU: 4 x ARMv7 cores available, using ondemand governor
  Memory: 1008MB (split 688MB ARM, 320MB GPU)
HW Block: |   ARM   |  Core  |  H264  |    SDRAM    |
Min Freq: | 1000MHz | 500MHz |   0MHz |    450MHz   |
Max Freq: | 1000MHz | 500MHz | 250MHz |    450MHz   |
Voltages: |        +4, 1.3940V        |  0, 1.2000V |
   Other: temp_limit=85, force_turbo=1, avoid_pwm_pll=1, hdmi_force_hotplug=1
Firmware: Jul 24 2015 14:44:13, version 0f482c5017ad4526a6beb77fe39c93189c664fd4 (clean) (release)
  Codecs: H264 WVC1 MPG2 VP8 VORBIS MJPG
  Booted: Sun Jul 26 12:38:59 2015

Time         ARM    Core    H264 Core Temp (Max)  IRQ/s     RX B/s     TX B/s
======== ======= ======= ======= =============== ====== ========== ==========
12:39:22 1000Mhz  500Mhz    0Mhz 39.55C (40.08C)    769          0          0
12:39:24 1000Mhz  500Mhz    0Mhz 39.55C (40.08C)    973          0          0
12:39:26 1000Mhz  500Mhz    0Mhz 41.16C (41.16C)  1,110          0          0
12:39:28 1000Mhz  500Mhz    0Mhz 39.01C (41.16C)    636          0          0
12:39:30 1000Mhz  500Mhz    0Mhz 39.01C (41.16C)    618          0          0
12:39:32 1000Mhz  500Mhz    0Mhz 37.93C (41.16C)    629          0          0

[username145]

What would have the greatest effect on improving skin animation/smoothness? GPU clock? What about memory split, if fan art is minimal?

[popcornmix]

What would have the greatest effect on improving skin animation/smoothness? GPU clock? What about memory split, if fan art is minimal?

I'd guess sdcard speed, then arm, then core (for jpeg decode), then v3d, then sdram.

[J_E_F_F]

dumb question: do any of the overclock settings speed up the wired ethernet at all (ARM/CORE)? I'm not sure if that is controlled by the ARM CPU, Core bus etc. or has a separate controller.

[popcornmix]

dumb question: do any of the overclock settings speed up the wired ethernet at all (ARM/CORE)? I'm not sure if that is controlled by the ARM CPU, Core bus etc. or has a separate controller.

On a Pi1 overclocking the arm can improve network performance a little, as high cpu can limit the amount of data sent/received.
On Pi2 that's rarely an issue, so no.

You should be able to get close to 100Mbits/s over ethernet on Pi2 which is higher than the highest bitrate BluRays.

[bertybassett]

Code:

dtoverlay=sdhost,overclock_50=100

This gives up to 42MB/s sequential read (stock is about 22MB/s) - see benchmarks using different overclocks here.

So let me get this straight I load openelec 15 beta 3 and then just put

Code:

dtoverlay=sdhost,overclock_50=100

into config.txt and reboot? Of course it all depends on what speed my SD can overclock too.


In advance thanks lads.