Latency on Virtual Switch - Hyper-V 2008R2 - Guest VM 2008R2 - HP

Posted on 2014-08-21
Last Modified: 2014-11-12
Experiencing an issue with unusual ping times from within a Hyper-V VM running 2008R2.

The configuration is as follows:

HP Proliant ML350 Gen8
Windows Server 2008 R2 running Hyper-V

Windows Server 2008 R2
2 x vCPU

See attached picture for ping times for an example of the issue. I believe this is causing unexpected issues with Office applications crashing when using/opening remote files as well as unexpected issues with 3rd party apps (Tasbooks).

When running a ping -t from the host to a network device, the ping responses are always <1ms. From within the VM is where the problem occurs.

Any help appreciated.

Virtual Machine Queues has been disabled, as per other suggestions found, along with the offloading.
Question by:utilize
    LVL 77

    Expert Comment

    by:David Johnson, CD, MVP
    a ping time of less than 1ms is about the fastest you can get.

    Author Comment

    I agree, I think.

    What about the attached image showing the problem?
    LVL 56

    Expert Comment

    by:Cliff Galiher
    The image attached has only a couple higher than 1ms, and those are so minor as to be negligible.

    Author Comment

    I wouldn't expect anything more than <1ms between virtual machine and host. Am I being unreasonable?

    Often those ping response times will reach teen figures.
    LVL 56

    Accepted Solution

    Yes, that's pretty unreasonable. Small variances are to be expected even on a high speed LAN.

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