Re: [Xen-users] Network performance in virtual machine (good upload speed, bad download)

[Fraser Campbell <fraser@xxxxxxxxxxxxxxxxxxxxx>]

Martin Nilsson wrote:

> performance in the virtual machine. When I upload data, I get good  
> speeds, around 6-7 MB/s which I think is ok on a 100 Mbit network.  When 
> I download however, I only get ~300 KB/s. On the host machine I  get 
> good speed in both direction.
Check that your NIC is set for full duplex, I have seen symptoms like 
you mention (outside of Xen) whenever the NIC is half-duplex.
As a rule we always use the following command on 100Mb interfaces:

  ethtool -s ethX autoneg off duplex full speed 100

Good luck,
Fraser

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