Thank you for contacting the Intel community.
I'm sorry, would you please explain to us what do you mean by full form of MXL in Intel Xeon Processors? I'm sorry to ask, I'm not able to find information based on MXL in Intel® Xeon processor.
Please let me know to better assist you.
I'm wondering if you still need help finding the information you are looking for? if so, I will appreciate if you can provide us with more information to further assist you.