site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Terry Lambert writes: [...]

Likewise, at least with FreeBSD's unified VM and buffer cache, and in NetBSD's case, their UVM implementation, and Windows, it's also likely better to avoid the possibility of fragmentation of the kernel virtual address map, even if it's a full 64 bits. The main issue is the number of pmap entries needed to support that large an address space grows as the address space becomes fragmented, even if the amount of available physical memory is relatively small. I believe this will also be a problem on Linux, unless something happened very recently to change things there; it may or may not be a problem on Solaris,

In overwhelming majority of cases Linux uses 1:1 mapping of physical to virtual memory in the kernel mode, and kernel `pmap' is modified quite rarely. All major memory consumers (file system, anonymous memory, slab allocator) work in 1:1 mode. Nikita. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com