[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [Xen-users] Re: Release 0.9.1 of GPL PV Drivers for Windows

> 100 Mb/s, but this is dom0<->domu, which is all software nics.
> the
> window size helps some, but not significantly, and I want a test that
> closer to real application usage. I'm not testing peak theoretical,
> especially with iometer.

FWIW, on my test system (1.8GHz AMD 1210):

iperf Dom0->DomU 200MBit/sec
iperf DomU->Dom0 840MBit/sec

If I go up to -w 256K I gain about 10-20% performance. I'm not sure, but
I suspect that the reason that Dom0->DomU speeds are so slow is that
xennet has to turn the gso (large send offload) packets into individual
packets manually, and also has to do manual checksumming. When the
entire process is CPU bound (eg all software NICs) then anything extra
the CPU has to do is going to make a difference.


Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.