100% CPU utilization when writing files (Gumstix Overo)

[AJ ONeal]

I have the OMAP3530 clocked at 720MHz and when writing either to tmpfs (/dev/shm) or SDHC (/) the CPU is pegged 100%.

10% is userspace

90% is kernel (2.6.36)

https://gist.github.com/797179

#!/bin/bash

dd if=/dev/zero of=~/data.tmp bs=512K count=1

while true

do

  cp ~/data.dat /dev/shm/

done

Any ideas what could be going on here?

AJ ONeal