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vSphere slow network speeds

Every time I run the VMware Health Check, it tells me I do not have my nics set to ‘autonegotiation’. Correct I do not.

When we started with vSphere ESX 4 the network speed seemed way to slow. Stuff would not go above 100mbit on a gigabit link. Tests between vm’s, test between hosts etc would not reach an expected speed.

The solution to this was to set all the connections (on physical switch as on host) to speed 1000 and duplex to full. After this speeds went up to 500+mbit.

I am curious if anybody else has had these results, or has any ideas on this matter.

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