Hello I'm trying to achieve higher than gigabit transferts over a virtio NIC with no success, and I can't find a recent bug or discussion about such an issue. The simpler test consist of two VM running on a high-end blade server with 4 cores and 4GB RAM each, and a virtio NIC dedicated to the inter-VM communication. On the host, the two vnet interfaces are enslaved into a bridge. I use a combination of 2.6.35 on the host and 2.6.32 in the VMs. Running iperf or netperf on these VMs, with TCP or UDP, result in ~900Mbits/s transferts. This is what could be expected of a 1G interface, and indeed the e1000 emulation performs similar. Changing the txqueuelen, MTU, and offloading settings on every interface (bridge/tap/virtio_net) didn't improve the speed, nor did the installation of irqbalance and the increase in CPU and RAM. Is this normal ? Is the multiple queue patch intended to address this ? It's quite possible I missed something :) Thank you dear list ! -- Thibault VINCENT SmartJog S.A.S. - Groupe TDF - Pôle multimédia 27 Bd Hippolyte Marques, 94200 Ivry sur Seine, France Phone : +33.1.58.68.62.38 Fax : +33.1.58.68.60.97
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