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Set netPktHeapMinSize=32 and netPktHeapMaxSize=128 to Enable Jumbo Frames and NetQueue (1004593)

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The combination of enabling VMware NetQueue and using jumbo frames can cause the network stack to run out of heap with the default values for netPktHeapMinSize and netPktHeapMaxSize .


Set the netPktHeapMinSize and netPktHeapMaxSize VMkernel parameters as follows:
Note: This procedure does not apply to ESX/ESXi 4.1 or later.
  1. Log in to VMware Infrastructure/vSphere Client.
  2. Click the Configuration tab for the ESX host.
  3. Click Advanced Settings.
  4. Click VMkernel.
  5. Find the corresponding value field for VMkernel.Boot.netPktHeapMaxSize and enter 128 .
  6. Find the corresponding value field for VMkernel.Boot.netPktHeapMinSize and enter 32 .
  7. Click OK to save the changes.
  8. Reboot the ESX host.

Update History

03/22/2010 - Added ESX 4.0, ESXi 3.5, and ESXi 4.0 to Products. 01/23/2012 - Added note this this KB does not apply to ESX/ESXi 4.1 or later hosts.

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