Date: Sat, 27 Feb 2010 22:43:33 +0100 From: Gerrit =?ISO-8859-1?Q?K=FChn?= <gerrit@pmp.uni-hannover.de> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-fs@freebsd.org, stable@freebsd.org, Willem Jan Withagen <wjw@digiware.nl> Subject: Re: mbuf leakage with nfs/zfs? Message-ID: <20100227224333.5bee38ac.gerrit@pmp.uni-hannover.de> In-Reply-To: <20100227193819.GA60576@icarus.home.lan> References: <20100226141754.86ae5a3f.gerrit@pmp.uni-hannover.de> <E1Nl1mb-0002Mx-M9@kabab.cs.huji.ac.il> <E1Nl2JK-00033U-Fw@kabab.cs.huji.ac.il> <20100226174021.8feadad9.gerrit@pmp.uni-hannover.de> <E1Nl6VA-000557-D9@kabab.cs.huji.ac.il> <20100226224320.8c4259bf.gerrit@pmp.uni-hannover.de> <4B884757.9040001@digiware.nl> <20100227080220.ac6a2e4d.gerrit@pmp.uni-hannover.de> <4B892918.4080701@digiware.nl> <20100227202105.f31cbef7.gerrit@pmp.uni-hannover.de> <20100227193819.GA60576@icarus.home.lan>
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On Sat, 27 Feb 2010 11:38:19 -0800 Jeremy Chadwick <freebsd@jdc.parodius.com> wrote about Re: mbuf leakage with nfs/zfs?: JC> I should point out that the NFS+ZFS-based filer doesn't actually do its JC> backups using NFS; it uses rsnapshot (rsync) over SSH. There is JC> intense network I/O during backup time though, depending on how much JC> data there is to back up. The NFS mounts (on the clients) are only JC> used to provide a way for people to get access to their nightly JC> backups in a convenient way; it isn't used very heavily. That's rather similar to my situation, I would say. Most traffic goes via rsync, nfs only gives access to home dirs, which are not intensively used. JC> I can do something NFS-intensive on any of the above clients if people JC> want me to kind of testing. Possibly an rsync with a source of the NFS JC> mount and a destination of the local disk would be a good test? Let me JC> know if anyone's interested in me testing that. >From the last emails I would say we get most out of it by comparing tcp and udp clients to make sure this happens only with udp (and it is still not quite clear to me if it also happens with a FBSD client using udp). OTOH it would be great if someone with the ability to actually fix something in the nfs code could get in this discussion to guide us to do the debugging needed to do so. cu Gerrit
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