David, I would recommend downloading the latest ixgbe and igb drivers from our sourceforge website, e1000.sf.net. Both of the drivers you are testing may not be fully compatible with the 2.6.27 kernel since there were a number of TX multiqueue changes made. This might be why you are seeing the issues you are seeing the kernel oopses on ixgbe, and the tx hangs from the igb driver. The updated drivers should be able to handle the new TX multiqueue much better than the older drivers did.
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