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ss: add more tcp socket diagnostics 

Display 4 additional tcp socket info fields :

backoff : exponential backoff
lastsnd : time in milli second since last send
lastrcv : time in milli second since last receive
lastack : time in milli second since last acknowledgement

$ ss -ti dst :22
State       Recv-Q Send-Q                  Local Address:Port
Peer Address:Port
ESTAB       0      0                        172.16.5.1:58470
172.17.131.143:ssh
	 cubic wscale:7,7 rto:228 rtt:30/20 ato:40 mss:1256 cwnd:6 ssthresh:4
send 2.0Mbps lastsnd:3480 lastrcv:3464 lastack:3464 rcv_rtt:81.5
rcv_space:87812

Signed-off-by: Eric Dumazet <edumazet@google.com>
This commit is contained in:
Eric Dumazet 2014-10-01 04:17:18 -07:00 committed by Stephen Hemminger
parent 68ac9ab339
commit 624a06e63f
1 changed files with 11 additions and 0 deletions
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11
misc/ss.c
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@ -1554,6 +1554,8 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
info->tcpi_rcv_wscale); info->tcpi_rcv_wscale);
if (info->tcpi_rto && info->tcpi_rto != 3000000) if (info->tcpi_rto && info->tcpi_rto != 3000000)
printf(" rto:%g", (double)info->tcpi_rto/1000); printf(" rto:%g", (double)info->tcpi_rto/1000);
if (info->tcpi_backoff)
printf(" backoff:%u", info->tcpi_backoff);
if (info->tcpi_rtt) if (info->tcpi_rtt)
printf(" rtt:%g/%g", (double)info->tcpi_rtt/1000, printf(" rtt:%g/%g", (double)info->tcpi_rtt/1000,
(double)info->tcpi_rttvar/1000); (double)info->tcpi_rttvar/1000);
@ -1583,6 +1585,15 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
/ rtt)); / rtt));
} }
if (info->tcpi_last_data_sent)
printf(" lastsnd:%u", info->tcpi_last_data_sent);
if (info->tcpi_last_data_recv)
printf(" lastrcv:%u", info->tcpi_last_data_recv);
if (info->tcpi_last_ack_recv)
printf(" lastack:%u", info->tcpi_last_ack_recv);
if (info->tcpi_pacing_rate && if (info->tcpi_pacing_rate &&
info->tcpi_pacing_rate != ~0ULL) { info->tcpi_pacing_rate != ~0ULL) {
printf(" pacing_rate %sbps", printf(" pacing_rate %sbps",