# Tuesday, September 08, 2009

VMWare - Slow Network Performance

Some days it's amazing the types of things you get involved in... We've been fighting some network issues on our VMWare box for the last couple monthes. Everything on the VMWare community kept referencing Tcp Segment Offloading or TsoEnable. After screwing around with this for a couple hours I got back to an idea someone else at work had regarding the actual VMWare system configuration.

Turns out the nic cards in VMWare were by default configured to only run at 100 mbps instead of 1000mbps. You can re-configure these without even turning off the virtual servers! Good thinking Andy! Here's a screen snap from the vmware management console and our resulting performance gain.

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