Interrupts in L4Linux

Norman Feske norman.feske at ...1...
Fri Mar 22 16:01:52 CET 2013

Hi Ivan,

> I've done test for nic_bridge, and I've updated page with results

thanks for posting the results. One thing left me wondering: In the last
scenario, the roles of both L4Linux instances look entirely symmetric.
How can it be that the benchmark produces different results when
swapping the roles of both instances? Are both instances configured
identically? In particular, do they have the same amount of RAM
configured? I'm asking because we observed that the TCP parameters of
the Linux TCP/IP stack depend on the memory available to Linux.

Apart from that, your measurement seems to support my presumption that
the driver is the bottleneck. Even with two Linux instances running and
the overhead introduced by the indirection via nic_bridge, the
throughput stays in the same order as native Linux.

Do you share my interpretation? If so, it would be worthwhile to focus
the investigation on the driver.


Dr.-Ing. Norman Feske
Genode Labs ·

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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