Re: DD not working--SUCCESS!

On Fri, 31 Aug 2007 12:50:42 -0500
Les Mikesell <lesmikesell@xxxxxxxxx> wrote:

Mikkel L. Ellertson wrote:

dd should not use lots of CPU time. The bottleneck is disk access
speed. Depending on the drivers used, and some tweaking, the system
may be spending a lot of time in the disk driver routines doing
basically nothing.

CPU use will depend on your disk controller. IDE controllers have a lot
of CPU overhead for seeks/positioning even if DMA is used for the data
transfer - that's why people still use SCSI for busy servers.

Thankfully no longer true as of SATA providing your controller does AHCI
or similar and the drives support NCQ

Alan

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