Tangential and not directly relevant, but I was testing an
embedded ARM system on Tuesday specifically for SDcard write
performance, and on
a Class-10 SDcard was able to sustain 40Mbyte/second on a
32Mbyte "sprint"--for 100 iterations. That's unrelated to USRP
performance,
but at least on ARM hardware writing to "decent" SD cards, you
can get pretty-good performance.
Just to add more to this discussion in case anyone is curious:
Unfortunately, this doesn't mean that ARM-based SoCs will follow this
trend. Using the ARM architecture doesn't guarantee good SD Card
support; it really comes down to the manufacturer of the chip itself.
For the E1xx devices, we are reliant on TI's capability to work well
with SD Cards, since it is the OMAP3 chip acting as the controller
(assuming, of course, that support in the Linux kernel is solid).
Cheers,
Ben
Fair enough. But on my Pandaboard, I get goodish SD card
performance--which uses a TI part. There *have* been issues with this
(Panda) board
and both SD-card compatibility and performance. My buddie's Panda-ES
device, for example, gets *sucky* SD card performance, whereas my
Panda-A3 gets good performance.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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