Disable LRO

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'''Go to:''' [[Implementing Virtualization Deployments |Implementing Virtualization Deployments]]<br>  
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'''Go to:''' [[Implementing Virtualization Deployments|Implementing Virtualization Deployments]]<br>  
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{{note| After upgrading the ESXi host to 4.1 or 5.0 and upgrading VMs to VMwareTools to 4.1 or 5.0, you may experience slow TCP performance on VMs running on the 4.1 or 5.0 ESXi host. You can address this situation by disabling Large Receive Offload (LRO) on the ESXi host.}}  
{{note| After upgrading the ESXi host to 4.1 or 5.0 and upgrading VMs to VMwareTools to 4.1 or 5.0, you may experience slow TCP performance on VMs running on the 4.1 or 5.0 ESXi host. You can address this situation by disabling Large Receive Offload (LRO) on the ESXi host.}}  
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<br> To disable LRO, follow this procedure:  
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{{note| If you're running CUCM 8.6 and above, the Linux version used in these releases is compatible with LRO, you don't have to worry about the settings on the host or which version of ESXi is running. Disabling LRO is recommended for CUCM versions 8.0 and 8.5 irrespective of ESXi version.}}
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To disable LRO, follow this procedure:  
#Log into the ESXi host or its vCenter with vSphere Client.  
#Log into the ESXi host or its vCenter with vSphere Client.  

Revision as of 07:38, 26 April 2013

Go to: Implementing Virtualization Deployments



Note Note: After upgrading the ESXi host to 4.1 or 5.0 and upgrading VMs to VMwareTools to 4.1 or 5.0, you may experience slow TCP performance on VMs running on the 4.1 or 5.0 ESXi host. You can address this situation by disabling Large Receive Offload (LRO) on the ESXi host.


Note Note: If you're running CUCM 8.6 and above, the Linux version used in these releases is compatible with LRO, you don't have to worry about the settings on the host or which version of ESXi is running. Disabling LRO is recommended for CUCM versions 8.0 and 8.5 irrespective of ESXi version.


To disable LRO, follow this procedure:

  1. Log into the ESXi host or its vCenter with vSphere Client.
  2. Select the host > Configuration > Software:Advanced Settings.
  3. Select Net and scroll down slightly more than half way.
  4. Set the following parameters from 1 to 0:
    • Net.VmxnetSwLROSL
    • Net.Vmxnet3SwLRO
    • Net.Vmxnet3HwLRO
    • Net.Vmxnet2SwLRO
    • Net.Vmxnet2HwLRO
  5. Reboot the ESXi host to activate these changes.

Your guest VMs should now have normal TCP networking performance.



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