taglinefilesource code
rt_mss589fs/nfs/nfsroot.croute.rt_mss = root_dev->mtu;
rt_mss39include/linux/route.hunsigned long  rt_mss;    /* per route MTU/Window   */
rt_mss1690net/ipv4/route.crt_add(flags, daddr, mask, gw, dev, r->rt_mss, r->rt_window, r->rt_irtt, metric);