[Barrelfish-users] Intel SCC latency measurements for MPB operations

Konstantin Zertsekel zertsekel at gmail.com
Tue Mar 1 16:32:17 CET 2011

Hi all,
I am engaged in the project with Intel SCC chip where communication latency
is important factor.
Now, according to RCCE inter-core Ping-Pong test, the minimum latency is 5
microseconds (see this
But according to latency table for various memory accesses by Intel (see this
the minimum latency (when accessing the local MPB with bypass) is measured
in ~100 clocks, not microseconds.
What is the reason for such a wide gap in RCCE implementation and hardware
latency table?
I guess all kinds of memory access latency measurements is a must-know stuff
for porting Barrelfish to SCC...
Thanks, KostaZ.
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