Commit 200d95f4 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

tcp: add TCPAckCompressed SNMP counter 



This counter tracks number of ACK packets that the host has not sent,
thanks to ACK compression.

Sample output :

$ nstat -n;sleep 1;nstat|egrep "IpInReceives|IpOutRequests|TcpInSegs|TcpOutSegs|TcpExtTCPAckCompressed"
IpInReceives                    123250             0.0
IpOutRequests                   3684               0.0
TcpInSegs                       123251             0.0
TcpOutSegs                      3684               0.0
TcpExtTCPAckCompressed          119252             0.0

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5d9f4262

include/uapi/linux/snmp.h

+1 −0
Original line number Diff line number Diff line
@@ -278,6 +278,7 @@ enum 
	LINUX_MIB_TCPMTUPSUCCESS,		/* TCPMTUPSuccess */

	LINUX_MIB_TCPDELIVERED,			/* TCPDelivered */

	LINUX_MIB_TCPDELIVEREDCE,		/* TCPDeliveredCE */

	LINUX_MIB_TCPACKCOMPRESSED,		/* TCPAckCompressed */

	__LINUX_MIB_MAX

};

net/ipv4/proc.c

+1 −0
Original line number Diff line number Diff line
@@ -298,6 +298,7 @@ static const struct snmp_mib snmp4_net_list[] = { 
	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),

	SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),

	SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),

	SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),

	SNMP_MIB_SENTINEL

};

net/ipv4/tcp_output.c

+2 −0
Original line number Diff line number Diff line
@@ -165,6 +165,8 @@ static inline void tcp_event_ack_sent(struct sock *sk, unsigned int pkts) 
	struct tcp_sock *tp = tcp_sk(sk);



	if (unlikely(tp->compressed_ack)) {

		NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPACKCOMPRESSED,

			      tp->compressed_ack);

		tp->compressed_ack = 0;

		if (hrtimer_try_to_cancel(&tp->compressed_ack_timer) == 1)

			__sock_put(sk);

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