<<On Fri, 08 Mar 2013 08:54:14 +0100, Andre Oppermann <an...@freebsd.org> said:
> [stuff I wrote deleted] > You have an amd64 kernel running HEAD or 9.x? Yes, these are 9.1 with some patches to reduce mutex contention on the NFS server's replay "cache". > Jumbo pages come directly from the kernel_map which on amd64 is 512GB. > So KVA shouldn't be a problem. Your problem indeed appears to come > physical memory fragmentation in pmap. I hadn't realized that they were physically contiguous, but that makes perfect sense. > pages. Also since you're doing NFS serving almost all memory will be > in use for file caching. I actually had the ZFS ARC tuned down to 64 GB (out of 96 GB physmem) when I experienced this, but there are plenty of data structures in the kernel that aren't subject to this limit and I could easily imagine them checkerboarding physical memory to the point where no contiguous three-page allocations were possible. -GAWollman _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
