[maemo-developers] [maemo-developers] speeding up MMC (with success)

From: Ralph Giles giles at xiph.org
Date: Fri Oct 6 10:26:03 EEST 2006
On Sat, Sep 30, 2006 at 10:28:50PM +0200, Frantisek Dufka wrote:

> you can test card speed like this
> Nokia770-26:~# time dd if=/dev/mmcblk0 of=/dev/null bs=8192 count=10240

Thanks for your excellent work on this. I tried the timing above with 
the zImage-su-18-200625-2gb-mmcplus52Mhz kernel:

64 MB card that came with the device:
1.4 MB/s with the 2006OS release kernel (61.25 MB in 44s) 
2.7 MB/s with the mmcplus52Mhz kernel (61.25 MB in 22.7s)

512 MB SanDisk RS-MMC:
1.4 MB/s with release kernel (80 MB in 58.5s)
1.8 MB/s with patched kernel (80 MB in 44s) !

2 GB Kingston MMCmobile (dual voltage spec v4):
doesn't work with release kernel
3.5 MB/s with patched kernel (80 MB in 22.7s)

So it seems, at almost the same price 6 months later, the 2 GB card 
was a much better deal!

I'd also very much recommend that Nokia include the 2 GB support patch 
in the next OS release. I had quite a moment of panic when, after 
seeing your report and buying the 2 GB card, it didn't work out of the 
box! But it's very nice to have this much storage available.


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