Bugs item #2834538, was opened at 2009-08-09 17:23 Message generated for change (Tracker Item Submitted) made by unki You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2834538&group_id=180599 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Andreas Unterkircher (unki) Assigned to: Nobody/Anonymous (nobody) Summary: low network speed with Windows virtio NIC drivers Initial Comment: Host-CPU: 2x Intel Xeon E5420 (Quad cores) Host: KVM 85 Host: 64-bit Guest: Windows XP (SP3) and Windows 2003 (SP2) We are powering several guests on a KVM host. All of them using TAP interfaces bridged together via one bridge. Within the guests we installed the lasted virtio NIC drivers (from that ISO file). While the Interface status show that the interfaces are set to 1Gbit/s, the maximum bandwidth we can achieve is about 100-120Mbit/s (tested with iperf). Funilly, one the same host, two Debian Lenny guests (so using 2.6.26 with builtin virtio modules) can achieve the full bandwidth of 1Gbit/s and more without a problem. So we suspect that the Windows virtio drivers for the NICs are causing this problem. How can we track down that problem? Can we provide more infos? We are willing to help in debuggig! Thx, Andreas ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2834538&group_id=180599 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
