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Thank you for contacting Intel.
I understand you have upgraded your network card from 1 Gbps to 10 GbE speed. Please make sure you are using a CAT 6 or 6A network cable. You may also try to connect to another port and see if it can improve the network performance.
You may refer to our website for the cable requirement for 10GbE connections here.
I hope this is helpful.
I verified that our cables are CAT 6A. So unfortunately that's not the issue. We even changed them out with others but no luck. It's only on our Linux servers where we are receiving the CRC errors. We have the same card in a Windows server and it functions flawlessly.
Thanks for writing back.
I see that the CRC Error happens only on Linux System. We also suggest to use the Linux driver supplied by HP since you are using an HP network card model. You may check for available driver for this NIC model HP 561FLR-T from HP's website. In case you still encounter CRC errors, please provide us more information. Error message (if any), where you see the error, etc.
Thanks for the suggestion, Sandy. I feel like that may be the best next thing to try. The reason I didn't use HP drivers initially is because we're on Redhat 6.6 and HP currently has drivers only up through 6.5. But reverting to 6.5 isn't that big of a task, and if it gets rid of the CRC errors, then I'll be happy.
I'll keep you posted with my results. I may have to wait until this weekend to perform the rollback of Redhat.