On Sep 19, 2013, at 22:06 , Patrick Dung wrote: > >We at Line Rate (now F5) are developing support for 1 Gig superpages on > >amd64. We're basing our work on 9.1.0 for now. > > > >An early preview is available here: > > > >https://github.com/Seb-LineRate/freebsd/tree/freebsd-9.1.0-1gig-pages-NOT-READY-2 > > That is cool. > > What type of applications can take advantage of the 1Gb page size? > And is it transparent? Or applications need to be modified?
It's transparent for the kernel: all of UMA and kmem_malloc()/kmem_free() is backed by 1 gig superpages. It's not transparent for userspace: applications need to pass a new flag to mmap() to get 1 gig pages. This is useful in applications with high memory pressure, where memory bandwidth and TLB misses are a limiting factor. -- Sebastian Kuzminsky _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
