net: make struct net_device::tx_queue_len unsigned int
4 billion packet queue is something unthinkable so use 32-bit value
for now.
Space savings on x86_64:
add/remove: 0/0 grow/shrink: 3/70 up/down: 16/-131 (-115)
function old new delta
change_tx_queue_len 94 108 +14
qdisc_create 1176 1177 +1
alloc_netdev_mqs 1124 1125 +1
xenvif_alloc 533 532 -1
x25_asy_setup 167 166 -1
...
tun_queue_resize 945 940 -5
pfifo_fast_enqueue 167 162 -5
qfq_init_qdisc 168 158 -10
tap_queue_resize 810 799 -11
transmit 719 698 -21
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 3f39d27..0150b2d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1824,7 +1824,7 @@ struct net_device {
#ifdef CONFIG_NET_SCHED
DECLARE_HASHTABLE (qdisc_hash, 4);
#endif
- unsigned long tx_queue_len;
+ unsigned int tx_queue_len;
spinlock_t tx_global_lock;
int watchdog_timeo;