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ss: print new tcp_info fields: busy, rwnd-limited, sndbuf-limited times 

Dump some new fields added to tcp_info in v4.10: tcpi_busy_time,
tcpi_rwnd_limited, tcpi_sndbuf_limited.

Example output for a flow busy for 110ms but never measurably limited by
receive window or send buffer:
   busy:110ms

Example output for a flow usually limited by receive window:
   busy:111ms rwnd_limited:101ms(91.0%)

Example output for a flow sometimes limited by send buffer:
   busy:50ms sndbuf_limited:10ms(20.0%)

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
This commit is contained in:
Yuchung Cheng 2016-12-01 13:21:40 -05:00 committed by Stephen Hemminger
parent 2f579872fb
commit b6c7fc61fa
1 changed files with 18 additions and 0 deletions
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18
misc/ss.c
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@ -817,6 +817,9 @@ struct tcpstat {
double rcv_rtt;
double min_rtt;
int rcv_space;
unsigned long long busy_time;
unsigned long long rwnd_limited;
unsigned long long sndbuf_limited;
bool has_ts_opt;
bool has_sack_opt;
bool has_ecn_opt;
@ -1980,6 +1983,18 @@ static void tcp_stats_print(struct tcpstat *s)
if (s->app_limited)
printf(" app_limited");
if (s->busy_time) {
printf(" busy:%llums", s->busy_time / 1000);
if (s->rwnd_limited)
printf(" rwnd_limited:%llums(%.1f%%)",
s->rwnd_limited / 1000,
100.0 * s->rwnd_limited / s->busy_time);
if (s->sndbuf_limited)
printf(" sndbuf_limited:%llums(%.1f%%)",
s->sndbuf_limited / 1000,
100.0 * s->sndbuf_limited / s->busy_time);
}
if (s->unacked)
printf(" unacked:%u", s->unacked);
if (s->retrans || s->retrans_total)
@ -2283,6 +2298,9 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
s.min_rtt = (double) info->tcpi_min_rtt / 1000;
s.delivery_rate = info->tcpi_delivery_rate * 8.;
s.app_limited = info->tcpi_delivery_rate_app_limited;
s.busy_time = info->tcpi_busy_time;
s.rwnd_limited = info->tcpi_rwnd_limited;
s.sndbuf_limited = info->tcpi_sndbuf_limited;
tcp_stats_print(&s);
free(s.dctcp);
free(s.bbr_info);