[Myrinet] DMA related question.

Hi, 

In MCP, Is it possible to write 2 separate pinned memory 
locations (in host memory) using a single DMA call ?  Both the 
updates are writing very small, immediate data.  If not, is 
their any other way by which we can update these two values 
without having to incur 2 separate DMA costs ?  I read something 
about use of a PIO but am not too clear on it yet !.  Could someone
please help in telling weather a PIO could be used along with
a DMA and will it help amortizing some overhead ?  What is the 
typical latency for a PIO call that will write, lets say, 4 bytes ? 
If there is a pointer which can explain how to use PIOs, 
it would be really helpful.

Thanks for your time,
Regards,
--Saurabh


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