Andy/Anyone else, I have finally gotten the tcp offload receive working, which should enhance performance somewhat, or at least stop things breaking so horribly. Please pull the latest source from hg, build it, and give it a go. All being well I''ll do another binary release shortly and get back to the other nagging issues that still seem to persist (eg /gplpv not hiding devices when it should). Performance values for a test from Dom0 to DomU using iperf are: Machine 1: ~800Mbits/sec (it''s doing a backup right now though) Machine 2: ~150Mbits/ Machine 2 is a very low end server (HP ML115). Machine 1 is a bit more powerful (HP DL385), as you may conclude from the results :) With your iperf results, I would also like to know what the loopback results (iperf -s and iperf -c on the same server) are for Dom0 and the Windows DomU. In my case: Machine 1 Dom0: ~2Gbits/sec Machine 1 DomU: ~800Mbits/sec (100% CPU) Machine 2 Dom0: ~2.5Gbits/sec (no backups running?) Machine 2 DomU: ~100Mbits/sec (66% CPU) James _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel