3 ms·
x86 in some modes (PSE but not PAE) has 4MB superpages, whereas in PAE mode or in x86_64 they're 2MB (first level). That's the only one I remember off-hand.
by loeg 3y ago
x86 in some modes (PSE but not PAE) has 4MB superpages, whereas in PAE mode or in x86_64 they're 2MB (first level). That's the only one I remember off-hand.
- RavSS 3y agoThere are also 1 GiB pages in long mode, but support depends on the processor and CPUID's output. Almost all modern x86 processors in the last several years should have it, I think.
- monocasa 3y agoSome also technically support it, but it doesn't gain you a whole lot as the TLB will split it down to a 2MB TLB entry. Could save a bit of L2 for the page table entries under the right conditions, but you've already lost if invoking your page walk hardware is in your fast path to begin with.
- deleted 3y ago[deleted]