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event id 252 hyperv-v-vmswitch RRS feed

  • Question

  • Dear,

    Any idea about below issue windows 2016 hyperV cluster.

    event id 252 hyperv-v-vmswitch

    Memory allocated for packets in a vRss queue (on CPU 26) on switch (Friendly Name: XYZ) due to low resource on the physical NIC has increased to 256MB. Packets will be dropped once queue size reaches 512MB.


    Regards,


    Hakim.B Sr.System Administrator

    Saturday, December 2, 2017 5:07 PM

Answers

  • Hi Hakim Bhungra,

    >By default it is set to 0. Please let me know how much shall I increase.

    In my lab, the value is 256 by default, you may increase it to 256 and test, if still not work, increase to 1024, check the result.

    Best Regards,

    Anne


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by Hakim Bhungra Wednesday, December 6, 2017 7:29 AM
    Wednesday, December 6, 2017 1:51 AM
    Moderator

All replies

  • Hi Hakim Bhungra,

    For network adapters that allow manual configuration of resources, such as receive and send buffers, you should increase the allocated resources. Some network adapters set their receive buffers low to conserve allocated memory from the host. The low value results in dropped packets and decreased performance. Therefore, for receive-intensive scenarios, we recommend that you increase the receive buffer value to the maximum.

    Please check the detailed information in the following article:

    https://technet.microsoft.com/en-us/library/jj574151%28v=ws.11%29.aspx?f=255&MSPPError=-2147217396

    So, we'd recommend to increase the "Receive buffers" in the physical NIC on the Hyper V hosts, check if it could help:

    Best Regards,

    Anne


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Monday, December 4, 2017 9:17 AM
    Moderator
  • Hi Anne,

    Thanks for quick respond.

    By default it is set to 0. Please let me know how much shall I increase.

    Regards,


    Hakim.B Sr.System Administrator

    Monday, December 4, 2017 7:16 PM
  • Hi Hakim Bhungra,

    >By default it is set to 0. Please let me know how much shall I increase.

    In my lab, the value is 256 by default, you may increase it to 256 and test, if still not work, increase to 1024, check the result.

    Best Regards,

    Anne


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Marked as answer by Hakim Bhungra Wednesday, December 6, 2017 7:29 AM
    Wednesday, December 6, 2017 1:51 AM
    Moderator
  • Thanks Anne.

    Really Appreciated.


    Hakim.B Sr.System Administrator

    Wednesday, December 6, 2017 7:29 AM