Interrupts in L4Linux

[Ivan Loskutov]

Hello Norman,

I continue to understand this problem.
I've tried to disable SMP in Fiasco.OC and remove VCPU affinity from
l4linux command line. For this case the benchmark with nic_bridge shows
symmetric results. I've obtained a bandwidth about 880 Mbit/s.



--
Ivan Loskutov



2013/3/22 Norman Feske <norman.feske at ...1...>

> Hi Ivan,
>
> > I've done test for nic_bridge, and I've updated page with results
> >
> http://ksyslabs.org/doku.php?id=genode_network_perfomance#nic_bridge_test
>
> 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.
>
> Cheers
> Norman
>
> --
> Dr.-Ing. Norman Feske
> Genode Labs
>
> http://www.genode-labs.com · http://genode.org
>
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