Very long time for context switch on SH2

[j.yates at quartzuk.com (James Yates)]

I am working on a custom BSP which has an SH2 7145f. I have performed a basic port for this SH7145 
cpu based on the SH7045 already in the tree. The 2 chips are very similar. However, after some 
analysis, the shortest time I seem to be able to measure for a context switch is 192us, which I 
think is pretty slow. Am I wrong?
I have been muckng around with the system clock to see if by increasing the ticks per second, the 
context switch time could be reduced but I can't get any better than 192us.

Does anyone have any ideas? Is there an Idle task that always runs? Could this be causing any 
problems? Any help will be gratefully received.

		Many Thanks

			James Yates
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/ms-tnef
Size: 2485 bytes
Desc: not available
Url : http://rtems.rtems.org/pipermail/rtems-users/attachments/20040322/99934ab9/attachment.bin