How can to increase the network throughput to guest VMs

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How can to increase the network throughput to guest VMs

February 4, 2010 Leave a comment Go to comments

Under load, the default buffer size used the by the virtual switch may provide inadequate buffer and result in packet loss. We recommend increasing the VM bus receive buffer from 1Mb to 2Mb.

Virtualized networking can be complicated, what with the root and child partitions relaying packets across the VM bus to reach the physical NIC. The VM bus, anticipating contention, uses buffers to queue data while the recipient VM is swapped out or otherwise not keeping up with the traffic. The default buffer size for WS08 R2 is 1Mb, which provides 655 packet buffers (1,600 bytes per buffer).

Want to know more about ? read the article by Tom Basham, Virtualization Performance PM, Windows Fundamentals Team

http://blogs.technet.com/winserverperformance/archive/2010/02/02/increase-vmbus-buffer-sizes-to-increase-network-throughput-to-guest-vms.aspx