Lars Eggert wrote: > Hi, > > every few days or so, my -STABLE NFS server (v3 and v4) gets wedged > with a ton of messages about "nfsd server cache flooded, try to > increase nfsrc_floodlevel" in the log, and nfsstat shows TCPPeak at > 16385. It requires a reboot to unwedge, restarting the server does > not help. > > The clients are (mostly) six -CURRENT nfsv4 boxes that netboot from > the server and mount all drives from there. > > I googled around and saw that others have hit this issue, but I > haven't seen any resolution posted. I guess I can increase > NFSRVCACHE_FLOODLEVEL in the source, but I wonder if I wouldn't > simply hit the increase value after a little while longer... > > Lars > You can either try this patch (which dynamically adjusts nfsrc_floodlevel along with handling a variety of overhead issues for the DRC under heavy load): http://people.freebsd.org/~rmacklem/drc4.patch
or just bump it up a bunch. The default value was safe for a server with 256Mbytes of ram and a default mbuf cluster limit. The only thing you might have to do along with bumping NFSRC_FLOODLEVEL up is increasing kern.ipc.mbclusters. The variant of the above patch will make it into head someday, once I merge in changes from ivoras@'s similar patch and confer with him about it. rick _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
