Here's some more info... A: # sysctl -a |grep mbuf kern.mbuf.msize = 256 kern.mbuf.mclbytes = 2048 kern.mbuf.nmbclusters = 8192 kern.mbuf.mblowat = 16 kern.mbuf.mcllowat = 8 B: # sysctl -a |grep mbuf kern.mbuf.msize = 256 kern.mbuf.mclbytes = 2048 kern.mbuf.nmbclusters = 32768 kern.mbuf.mblowat = 16 kern.mbuf.mcllowat = 8