VM NIC TCP SEGMENTATION OFFLOADING

[zhangfred_vm]

Hi Experts,

Does the VM nic support the TSO?

thanks.

[AWo]

The virtual one? Yes. At least the vmxnet3 type.

AWo

VCP 3 & 4

Author @ vmwire.net

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[zhangfred_vm]

thank you, how to watch it.

I use the "ifconfig" command, but I din't see the TSO releated info.

[AWo]

Is your virtual NIC a vmxnet3?

Which guest OS do you use?

Where do you expect to see TSO information?

AWo

VCP 3 & 4

Author @ vmwire.net

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[AWo]

Check KB 1001805. vmxnet2 supports TSO, as well.

AWo

VCP 3 & 4

Author @ vmwire.net

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[zhangfred_vm]

Yes， it is the vmxnet 3.

The Guest is os is suse 10.3.

It is said we can see the TSO related info,by the ifconfig command.

but I didn't see such info.

linux-hdof:~ # ifconfig

eth4 Link encap:Ethernet HWaddr 00:50:56:A3:76:9E

inet addr:10.32.33.121 Bcast:10.32.33.255 Mask:255.255.255.0

inet6 addr: fe80::250:56ff:fea3:769e/64 Scope:Link

UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1

RX packets:11766 errors:0 dropped:0 overruns:0 frame:0

TX packets:141 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:904177 (882.9 Kb) TX bytes:18021 (17.5 Kb)

[AWo · Accepted solution]

Try "ethtool -k eth0". It shows you if it is set to on or off.

With "ethtool -K eth0 tso on" you can switch it on.

Note that the "K" is upper case when you want to set the paramter!

AWo

VCP 3 & 4

Author @ vmwire.net

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[zhangfred_vm]

So great! Thank you very much!

what do you suggest, to turn on or not?

-

---

linux-hdof:~ # ethtool -k eth4

Offload parameters for eth4:

Cannot get device udp large send offload settings: Operation not supported

rx-checksumming: on

tx-checksumming: on

scatter-gather: on

tcp segmentation offload: on

udp fragmentation offload: off

generic segmentation offload: off

-

---

[AWo]

Huh, I don't know....you should try what's best for you. Whatch all guests when you try as this might have a negative effect on other guests. Someone has to do the work you offload.....

AWo

VCP 3 & 4

Author @ vmwire.net

\[:o]===\[o:]

=Would you like to have this posting as a ringtone on your cell phone?=

=Send "Posting" to 911 for only $999999,99!=