Hi Laurent,
On Wed, Oct 29, 2014 at 10:49 AM, Laurent Pinchart
<laurent.pinchart@xxxxxxxxxxxxxxxx> wrote:
> I've performed quick SDHI performance tests yesterday. Read performance were
> around 7.5% lower with DMA support. Write performances varied but seemed
> similar on average.
>
> - PIO
>
> # time dd if=/dev/mmcblk1 of=/mnt/ram/mmc.bin count=32768 bs=4096
> 262144+0 records in
> 262144+0 records out
262144 records? Did it get split in 512 byte records?
> # time dd of=/dev/mmcblk1 if=/mnt/ram/mmc.bin count=32768 bs=4096
> 32+0 records in
> 32+0 records out
Only 32 records?
> - DMA
>
> # time dd if=/dev/mmcblk1 of=/mnt/ram/mmc.bin count=32768 bs=4096
> 32+0 records in
> 32+0 records out
Only 32 records?
> # time dd of=/dev/mmcblk1 if=/mnt/ram/mmc.bin count=32768 bs=4096
> 32768+0 records in
> 32768+0 records out
OK
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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