Windows Server Performance Team: Increase VMBus buffer sizes to increase network throughput to guest VMs

Windows Server Performance Team: Increase VMBus buffer sizes to increase network throughput to guest VMs

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The Windows Server Performance team have done a really interesting post on how to optimize network performance inside of virtual machines by increasing the size of the VMBus buffers used by our network adapters.  They also do a very good job of explaining the causes and implications of performance issues around virtual networking – so go check it out:

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

Cheers,
Ben

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  • Nice.. post.. we do require a large buffer storage when we work in a larger network..

  • Hi,

    We have a Windows Server 2008 R2 with Hyper-V running a virtual Windows 2008 R2 server with SQL Server 2008.  It runs SQL Server and a shared folder, these are accessed by about 10 to 15 users regularly.  Connectivity to the server gets lost intermittently without any identifiable cause.  Each of the virtual machines running on the Hyper-V server has a dedicated NIC assigned and we have also attempted the tweak described in this post to attempt to resolve the issue.  All to no avail.  Since, this is a production server this is becoming a cumbersome issue to say the least.  Other virtual machines on the server don't seem to have any issues with connectivity.  Anything you can suggest to resolve this or to find some indication of what is occurring?  

    Thanks.  

  • Keep Losing Network Connection -

    The first thing I would check is physical network adapters that you are using.  I had a Hyper-V server that had similar problems - and was able to fix it by changing to a newer Intel NIC.

    Cheers,

    Ben

  • Any Intel NICs you would recommend?  

  • No specific models off the top of my head.

    Cheers,

    Ben

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