[Xen-devel] Poor network performance in domU in unstable

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

hi,

with unstable as of April 21st, I am getting fairly bad networking 
performance in my domUs, e.g 125Mbits/s TCP with iPerf over a gigabit 
link, where dom0 gets around 700Mbits/s.
This is with a non-debug build of Xen, with a bridged setup created with 
vmtools, and both with and without use of grant tables.
If I run Xen with hyperthreading enabled, the figure improves somewhat, 
to 165Mbits/s in domU.
Is anyone else seeing the same behaviour with unstable? Is there some 
magic switch I need to flip (that perhaps vmtools does not know about) 
to prevent domain I/O being throttled by Xen?
thanks,
Jacob

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