On Sat, Feb 27, 2010 at 10:53:00PM +0100, Willem Jan Withagen wrote: > On 27-2-2010 21:32, Eirik Øverby wrote: > >I've had a discussion with some folks on this for a while. I can easily > >reproduce this situation by mounting a FreeBSD ZFS filesystem via > >NFS-UDP from an OpenBSD machine. Telling the OpenBSD machine to use TCP > >instead of UDP makes the problem go away. > > > >Other FreeBSD systems mounting the same share, either using UDP or TCP, > >does not cause the problem to show up. > > > >A patch was suggested by Rick Macklem, but that did not solve the issue: > >http://lists.freebsd.org/pipermail/freebsd-current/2009-December/014181.html > > I concur. > Everything in my network is now on TCP, and there is no mbuf leakage. > I just don't get over the 5500 mark, no matter what I throw at it. > > I do feel that TCP is not as well performing on a local net with Linux, > hence the choice for UDP. But TCP is workable as next best.
I'm pulling in Robert Watson, who has some familiarity with the UDP stack/code in FreeBSD. I'm not sure he'll be a sufficient source of knowledge for this specific issue since it appears (?) to be specific to NFS; Rick Macklem would be a better choice, but as reported, he's MIA. Robert, are you aware of any changes or implementation issues which might cause excessive (read: leaking) mbuf use under UDP-based NFS? Do you know of a way folks could determine the source of the leak, either via DDB or while the system is live? -- | Jeremy Chadwick j...@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
