On Wed, Apr 10, 2013 at 7:49 PM, Wojciech Puchar <[email protected]> wrote: >> How do your tests work? Do you examine PTEs directly to check for >> superpages >> or are you relying on the vm.pmap.pde sysctls? > > > the later. > > anyway - algorithm described on list - that heuristics detects consecutive > page access doesn't really help the urgent case - RANDOM access to large > amount of memory. > > sequential access will get minimal improvement. > > IMHO the only way that really make sens is to add options to madvise to give > kernel information about usage.
Solaris has an API to control the usage for large pages, search for MPSS - multiple page size support. It consists of APIs in madvise, and /usr/bin/pagesize -a to list all available page sizes, and other stuff. Since this has been established since at least Solaris 9 (and 10) and is used by database and HPC software, it might be a good starting point. _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
