I've been trying to work with large Umem areas and have a few questions . I'd appreciate any help or pointers. If it makes any difference, my AF_XDP testing is with i40e. 1) I use kernel args to reserve huge pages on boot. The application mmap call with the huge TLB flag appears to use huge pages as I can see the count of used huge pages go up (/proc/meminfo). However, the number of pages used by the umem, as shown in ss output, looks to still be 4k pages. Are there plans to support huge pages in Umem? How hard would this be? 2) It looks like there is a limit of 2GB on the maximum Umem size? I've tried with and without huge pages. Is this fundamental? How hard would it be to increase this? For both of these, I'd like to try to help make them happen. If the kernel side changes are deep or large, it may be beyond me but I can offer lab equipment and testing. Thanks.
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