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

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

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,

Xen-users mailing list



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