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The Opterons do not support 1G pages in their ITLBs, so code in 1G mappings is to be avoided. This shouldn't be an issue.
- Xeon (Nehalem):
- 64-entry fully4-way set-associative L1 data TLB for 4K pages
- 32-entry fully4-way set-associative L1 data TLB for 2M and 4M pages
- supports 4K, 2M and 4M pages. NO 1G PAGES
- 512-entry unified 4-way set-associative L2 TLB, which only supports 4K pages
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