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net: loopback: set default mtu to 64K

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loopback current mtu of 16436 bytes allows no more than 3 MSS TCP
segments per frame, or 48 Kbytes. Changing mtu to 64K allows TCP
stack to build large frames and significantly reduces stack overhead.

Performance boost on bulk TCP transferts can be up to 30 %, partly
because we now have one ACK message for two 64KB segments, and a lower
probability of hitting /proc/sys/net/ipv4/tcp_reordering default limit.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-09-23 22:28:59 +00:00 committed by David S. Miller
parent 2a6c8c7998
commit 0cf833aefa
1 changed files with 1 additions and 1 deletions
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drivers/net/loopback.c
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@ -157,7 +157,7 @@ static const struct net_device_ops loopback_ops = {
*/
static void loopback_setup(struct net_device *dev)
{
dev->mtu = (16 * 1024) + 20 + 20 + 12;
dev->mtu = 64 * 1024;
dev->hard_header_len = ETH_HLEN; /* 14 */
dev->addr_len = ETH_ALEN; /* 6 */
dev->tx_queue_len = 0;