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tcp: ensure prior synack rtx behavior with small backlogs 

Some applications use a listen() backlog of 1.

Prior kernels were silently enforcing a qlen_log of 4, so that we were
sending up to /proc/sys/net/ipv4/tcp_synack_retries SYNACK messages.

Fixes: ef547f2ac1 ("tcp: remove max_qlen_log")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-06 14:49:58 -07:00 committed by David S. Miller
parent 686a562449
commit acb4a6bfc8
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/inet_connection_sock.c
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@ -579,7 +579,7 @@ static void reqsk_timer_handler(unsigned long data)
* ones are about to clog our table.
*/
qlen = reqsk_queue_len(queue);
if ((qlen << 1) > sk_listener->sk_max_ack_backlog) {
if ((qlen << 1) > max(8U, sk_listener->sk_max_ack_backlog)) {
int young = reqsk_queue_len_young(queue) << 1;
while (thresh > 2) {