Memory bandwidth

[tom3q]

have the same values too - so we have a slow ram, or a slow controller for a fast ram?

No idea, really. The hardware looks good and it shouldn't cause this. The memory is MobileDDR running at 266MHz/CL3 and the controller is a standard ARM PrimeCell, so nothing what could be messed by Samsung.

[Yuna]

maybe our friends at samsung can help us? those who help us with the rest

[tom3q]

maybe our friends at samsung can help us? those who help us with the rest

Our friends at samsung? Do such exist?

[tom3q]

I have managed to increase AHB frequency to 166 MHz, switching CPU to asynchronous mode and increasing APB divisor to keep it at stock 66 MHz (and so prevent desynchronized timer clock). I'm still testing stability and power consumption of this configuration. Keep in mind that it can't be called a solution for the bus issue, rather a workaround.

Some benchmarks:
REMOVED


Gosh, please disregard this. I missed the point that PCLK divider support only even ratios and in fact it was running with wrong timer clock. Fixed it by overclocking PCLK to 82,5 MHz, but the results aren't that good anymore.

/ # /tmp/memspeed.static -c
*** Memory Write Throughput (in MB/s) ***
method           uncached  write alloc       cached  cached + wa
STRB                19.03       102.65        28.57       630.20
STR                 70.51       111.44        77.48      2369.88
STM4               293.97       133.86       305.09      4252.59
STM8               512.05       126.66       508.49      4248.94
STRD               152.83       117.49^C

However the system still feels a bit smoother, maybe because of using asynchronous mode or the GPU overclocked to 166 MHz, as it uses HCLK for clocking.

[boofman]

looks good, Master Tom3q! How were you able to achieve this? maybe we could replicate this on the current Froyo kernels we have!

Sent from my GT-I5700 using Tapatalk

[tom3q]

looks good, Master Tom3q! How were you able to achieve this? maybe we could replicate this on the current Froyo kernels we have!

Sent from my GT-I5700 using Tapatalk

Please disregard original contents of my previous post. I edited it after I found my mistake.