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HP Integrity Virtual Machines Version 4.0 Release Notes > Chapter 7 Networking Information

Do Not Turn on TSO on the VM Host and on HP-UX Guests


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TCP Segmentation Offload (TSO) is turned off by default in HP-UX. HP recommends that you leave it turned off on both the VM Host system and on HP-UX guests. This applies to both the virtual network interface cards in the guest and any physical network interface cards in the VM Host that are used by vswitches. When TSO is enabled, guest networks are interrupted.

To verify whether TSO is turned on, enter the following command:

# lanadmin -x vmtu n

Where n is the VM Host interface, as displayed by the hpvmnet command. For example, to verify that TSO is on for lan0, enter the following command:

# lanadmin -x vmtu 0 Driver/Hardware supports TCP Segmentation Offload, Current VMTU = 32160

To turn TSO off on lan0, use the following command:

# lanadmin -X vmtu 0 0 Virtual MTU is set to 0

Note that this restriction applies to VIO interfaces.

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