I know nothing about this, but wouldn't most textures be quite small, and with a large page size you might end up reading in much more than you need, making it often worse than useless?
That's 113 pages, does this really cover the issue of reading too much? IF so, I'll try and find the time.
I mean I'm not complaining about TLB issues which large pages do better at for obvious reasons, but thrashing the TLB is likely to be a lot cheaper than reading too much from the disk.