Date: Wed, 8 May 2013 08:35:18 +1000 From: "Dewayne Geraghty" <dewayne.geraghty@heuristicsystems.com.au> To: "'Mikolaj Golub'" <trociny@freebsd.org>, "=?iso-8859-1?Q?'G=F6ran_L=F6wkrantz'?=" <goran.lowkrantz@ismobile.com> Cc: freebsd-stable@freebsd.org, 'Kostik Belousov' <kib@freebsd.org> Subject: RE: Nullfs leaks i-nodes Message-ID: <56EF269F84824D8DB413D289BB8CBE19@as.lan> In-Reply-To: <20130507204149.GA3267@gmail.com> References: <B799E3B928B18B9E6C68F912@[172.16.2.62]> <20130507204149.GA3267@gmail.com>
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> -----Original Message----- > From: owner-freebsd-stable@freebsd.org > [mailto:owner-freebsd-stable@freebsd.org] On Behalf Of Mikolaj Golub > Sent: Wednesday, 8 May 2013 6:42 AM > To: Göran Löwkrantz > Cc: Kostik Belousov; freebsd-stable@freebsd.org > Subject: Re: Nullfs leaks i-nodes > > On Tue, May 07, 2013 at 08:30:06AM +0200, Göran Löwkrantz wrote: > > I created a PR, kern/178238, on this but would like to know > if anyone has > > any ideas or patches? > > > > Have updated the system where I see this to FreeBSD > 9.1-STABLE #0 r250229 > > and still have the problem. > > I am observing an effect that might look like inode leak, which I > think is due free nullfs vnodes caching, recently added by kib > (r240285): free inode number does not increase after unlink; but if I > purge the free vnodes cache (temporary setting vfs.wantfreevnodes to 0 > and observing vfs.freevnodes decreasing to 0) the inode number grows > back. > > You have only about 1000 inodes available on your underlying fs, while > vfs.wantfreevnodes I think is much higher, resulting in running out of > i-nodes. > > If it is really your case you can disable caching, mounting nullfs > with nocache (it looks like caching is not important in your case). > > -- > Mikolaj Golub > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to > "freebsd-stable-unsubscribe@freebsd.org" > Hi Goran, After I included Kib's vnode caching patch the performance on my "port builder" machine, decreased significantly. The "port builder" is one of many jails and nullfs is used extensively. I was starving the system of vnodes. Increasing the kern.maxvnodes, resulted in better performance than the original system configuration without vnode caching. Thanks Kib :) I don't think you'll run out of vnodes as it is self adjusting (that was my concern too) I changed kern.maxvnode to approx 3 times what it wanted and tuned for my needs. Try it and keep an eye on: sysctl vfs.numvnodes vfs.wantfreevnodes vfs.freevnodes vm.stats.vm.v_vnodepgsout vm.stats.vm.v_vnodepgsin Regards, Dewaynehome | help
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