MFCard access speed difference between RPi and Beaglebone

[Tim Kientzle]

On Feb 21, 2013, at 6:45 AM, Werner Thie wrote:

> Hi
> 
> trying to nail down the crash and core dump in Python when importing ctypes I did a parallel build of python on both systems with the same SVN rev 246947 of kernel.
> 
> The RPi seems to beat the Bbone quite clearly with a ration of 6 : 10
> 
> It is very apparent (when unpacking for instance) that the Bb shows a much more pronounced 'hickup' behavior, unpacking 40-60 files and then most probably doing disk IO.
> 
> Swapping the MFCards does not change the situation at all.
> 
> Can anybody out there suppprt this observation and/or explain it?

I've seen the same behavior with things like SVN checkouts;
the BBone runs quite smoothly for a while and then stalls.

I've been assuming that it was the MMCSD driver; skimming
through the code, it looks like there's a lot of room for
improvement.

Tim