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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: Eric Dumazet <edumazet@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -278,6 +278,7 @@ enum
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LINUX_MIB_TCPMTUPSUCCESS, /* TCPMTUPSuccess */
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LINUX_MIB_TCPDELIVERED, /* TCPDelivered */
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LINUX_MIB_TCPDELIVEREDCE, /* TCPDeliveredCE */
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LINUX_MIB_TCPACKCOMPRESSED, /* TCPAckCompressed */
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__LINUX_MIB_MAX
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};
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@ -298,6 +298,7 @@ static const struct snmp_mib snmp4_net_list[] = {
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SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
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SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
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SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),
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SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),
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SNMP_MIB_SENTINEL
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};
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@ -165,6 +165,8 @@ static inline void tcp_event_ack_sent(struct sock *sk, unsigned int pkts)
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struct tcp_sock *tp = tcp_sk(sk);
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if (unlikely(tp->compressed_ack)) {
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NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPACKCOMPRESSED,
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tp->compressed_ack);
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tp->compressed_ack = 0;
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if (hrtimer_try_to_cancel(&tp->compressed_ack_timer) == 1)
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__sock_put(sk);
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