in-kernel nmbcluster bump

--- kern/kern_mbuf.c.orig       2010-06-13 19:09:06.000000000 -0700
+++ kern/kern_mbuf.c    2013-05-11 19:26:26.000000000 -0700
@@ -114,7 +114,13 @@ tunable_mbinit(void *dummy)

        /* This has to be done before VM init. */
        if (nmbclusters == 0)
+#if 0
+               /* XXX Quite frankly, this formula sucks if you have igb(4),
+                * ix(4), ti(4), or any other mbuf-hungry driver XXX */
                nmbclusters = 1024 + maxusers * 64;
+#else
+               nmbclusters = 242144;
+#endif
        nmbjumbop = nmbclusters / 2;
        nmbjumbo9 = nmbjumbop / 2;
        nmbjumbo16 = nmbjumbo9 / 2;