High CPU Utilization Coping to a CF Card in a PCMCIA slot

[VDC]

We have a situation where we are copying files from the
hard drive to a Kingston CF Card in the PC jCard Slot.
The CPU utilization for this is very high from 90% to
100% during the duration of the copy. If you do the same
copy from one directory to another on the harddrive the
percentage is about 5%. Is this a problem or is this how
the interface works to the PC Card slot???

 

[James Martin]

This is most likely normal. I'm not familiar with the compact flash cards
first hand, but it all depends on whether the interface has a DMA (Direct
Memory Address) channel or not. If not, everything gets routed through the
CPU on the way to it's final destination (whether it be ram, hard drive,
etc). Copying within your hard drive is handled entirely by the drive
itself (the controller is onboard, and the HD also has a DMA) You can check
whether the interface has a DMA channel from within the device manager for
your system.

-James

 

[Bob Willard]

We have a situation where we are copying files from the
hard drive to a Kingston CF Card in the PC jCard Slot.
The CPU utilization for this is very high from 90% to
100% during the duration of the copy. If you do the same
copy from one directory to another on the harddrive the
percentage is about 5%. Is this a problem or is this how
the interface works to the PC Card slot???

Seems normal: copying a folder from my CF card to a HD uses 100% of
the CPU for the duration of copying.