diff options
author | Florin Coras <fcoras@cisco.com> | 2019-09-10 23:26:27 -0700 |
---|---|---|
committer | Andrew Yourtchenko <ayourtch@gmail.com> | 2019-09-30 15:27:12 +0000 |
commit | 69460ae11c71cbab2b298b85dbddb4f2add8fb67 (patch) | |
tree | e9d4476364c8910c81330e34924b87c853568607 | |
parent | 079895d95f40a0f32e2bafcaf16f167f60633edf (diff) |
tcp: compute snd time for rate sample
Type: feature
Change-Id: I6bd675dc28dbc34293e895911efe986844c0564f
Signed-off-by: Florin Coras <fcoras@cisco.com>
(cherry picked from commit 7436b436733ea7217e745f3cc9971aaff1e3dfa4)
-rw-r--r-- | src/plugins/unittest/tcp_test.c | 40 | ||||
-rw-r--r-- | src/vnet/tcp/tcp.h | 4 | ||||
-rw-r--r-- | src/vnet/tcp/tcp_bt.c | 13 |
3 files changed, 28 insertions, 29 deletions
diff --git a/src/plugins/unittest/tcp_test.c b/src/plugins/unittest/tcp_test.c index 42fa423bfae..f6a389c5c88 100644 --- a/src/plugins/unittest/tcp_test.c +++ b/src/plugins/unittest/tcp_test.c @@ -820,14 +820,6 @@ tbt_seq_lt (u32 a, u32 b) return seq_lt (a, b); } -static inline int -approx_equal (u32 a, u32 b) -{ - if (b > 0.99 * a && b < 1.01 * a) - return 1; - return 0; -} - static int tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input) { @@ -894,9 +886,8 @@ tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input) TCP_TEST (rs->interval_time == 1, "ack time should be 1"); TCP_TEST (rs->delivered == burst, "delivered should be 100"); TCP_TEST (rs->prior_delivered == 0, "sample delivered should be 0"); - TCP_TEST (approx_equal (rate, rs->tx_rate), "rate should be %u is %u", rate, - rs->tx_rate); TCP_TEST (!(rs->flags & TCP_BTS_IS_RXT), "not retransmitted"); + TCP_TEST (tc->first_tx_time == 1, "first_tx_time %u", tc->first_tx_time); /* 3) track second burst at time 2 */ tcp_bt_track_tx (tc); @@ -934,10 +925,9 @@ tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input) TCP_TEST (rs->interval_time == 2, "ack time should be 2"); TCP_TEST (rs->delivered == 2 * burst, "delivered should be 200"); TCP_TEST (rs->prior_delivered == burst, "delivered should be 100"); - TCP_TEST (approx_equal (rate, rs->tx_rate), "rate should be %u is %u", rate, - rs->tx_rate); TCP_TEST (!(rs->flags & TCP_BTS_IS_RXT), "not retransmitted"); TCP_TEST (!(bts->flags & TCP_BTS_IS_APP_LIMITED), "not app limited"); + TCP_TEST (tc->first_tx_time == 2, "first_tx_time %u", tc->first_tx_time); /* * Track retransmissions @@ -947,7 +937,7 @@ tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input) snd_una = tc->snd_una; - /* 1) track first burst a time 4 */ + /* 1) track first burst at time 4 */ tcp_bt_track_tx (tc); tc->snd_nxt += burst; @@ -1003,10 +993,11 @@ tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input) TCP_TEST (rs->delivered == 30, "delivered should be 30"); TCP_TEST (rs->prior_delivered == 3 * burst, "sample delivered should be %u", 3 * burst); - TCP_TEST (approx_equal (rate, rs->tx_rate), "rate should be %u is %u", rate, - rs->tx_rate); TCP_TEST (!(rs->flags & TCP_BTS_IS_RXT), "not retransmitted"); TCP_TEST (!(rs->flags & TCP_BTS_IS_APP_LIMITED), "not app limited"); + /* All 3 samples have the same delivered number of bytes. The first + * sets the first tx time */ + TCP_TEST (tc->first_tx_time == 4, "first_tx_time %u", tc->first_tx_time); /* 6) Retransmit and track at time 9 * @@ -1079,20 +1070,22 @@ tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input) TCP_TEST (tc->delivered_time == 10, "delivered time should be 10"); TCP_TEST (tc->delivered == 5 * burst + 40, "delivered should be %u is %u", 5 * burst + 40, tc->delivered); - /* A rxt was acked and delivered time for it is 8 (last ack time) */ - TCP_TEST (rs->interval_time == 2, "ack time should be 2 is %.2f", + /* A rxt was acked and delivered time for it is 8 (last ack time) so + * ack_time is 2 (8 - 10). However, first_tx_time for rxt was 4 and rxt + * time 9. Therefore snd_time is 5 (9 - 4)*/ + TCP_TEST (rs->interval_time == 5, "ack time should be 5 is %.2f", rs->interval_time); /* delivered_now - delivered_rxt ~ 5 * burst + 40 - 3 * burst - 30 */ TCP_TEST (rs->delivered == 2 * burst + 10, "delivered should be 210 is %u", rs->delivered); TCP_TEST (rs->prior_delivered == 3 * burst + 30, "sample delivered should be %u", 3 * burst + 30); - TCP_TEST (approx_equal (rate, rs->tx_rate), "rate should be %u is %u", rate, - rs->tx_rate); TCP_TEST (rs->flags & TCP_BTS_IS_RXT, "is retransmitted"); /* Sample is app limited because of the retransmits */ TCP_TEST (rs->flags & TCP_BTS_IS_APP_LIMITED, "is app limited"); TCP_TEST (tc->app_limited, "app limited should be set"); + TCP_TEST (tc->first_tx_time == 9, "first_tx_time %u", tc->first_tx_time); + /* * 8) check delivery rate at time 11 @@ -1112,8 +1105,10 @@ tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input) TCP_TEST (tc->delivered_time == 11, "delivered time should be 11"); TCP_TEST (tc->delivered == 7 * burst, "delivered should be %u is %u", 7 * burst, tc->delivered); - /* Last rxt was at time 8 */ - TCP_TEST (rs->interval_time == 3, "ack time should be 3 is %.2f", + /* Delivered time at retransmit was 8 so ack_time is 11 - 8 = 3. However, + * first_tx_time for rxt was 4 and rxt time was 9. Therefore snd_time + * is 9 - 4 = 5 */ + TCP_TEST (rs->interval_time == 5, "ack time should be 5 is %.2f", rs->interval_time); /* delivered_now - delivered_rxt ~ 7 * burst - 3 * burst - 30. * That's because we didn't retransmit any new segment. */ @@ -1121,11 +1116,10 @@ tcp_test_delivery (vlib_main_t * vm, unformat_input_t * input) rs->delivered); TCP_TEST (rs->prior_delivered == 3 * burst + 30, "sample delivered should be %u", 3 * burst + 30); - TCP_TEST (approx_equal (rate, rs->tx_rate), "rate should be %u is %u", rate, - rs->tx_rate); TCP_TEST (rs->flags & TCP_BTS_IS_RXT, "is retransmitted"); TCP_TEST (rs->flags & TCP_BTS_IS_APP_LIMITED, "is app limited"); TCP_TEST (tc->app_limited == 0, "app limited should be cleared"); + TCP_TEST (tc->first_tx_time == 9, "first_tx_time %u", tc->first_tx_time); /* * 9) test flush diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h index 4c4a9a525af..227b3f8a856 100644 --- a/src/vnet/tcp/tcp.h +++ b/src/vnet/tcp/tcp.h @@ -240,7 +240,7 @@ typedef struct tcp_bt_sample_ u64 delivered; /**< Total delivered bytes for sample */ f64 delivered_time; /**< Delivered time when sample taken */ f64 tx_time; /**< Transmit time for the burst */ - u64 tx_rate; /**< Tx pacing rate */ + f64 first_tx_time; /**< Connection first tx time at tx */ tcp_bts_flags_t flags; /**< Sample flag */ } tcp_bt_sample_t; @@ -251,7 +251,6 @@ typedef struct tcp_rate_sample_ f64 prior_time; /**< Delivered time of sample used for rate */ f64 interval_time; /**< Time to ack the bytes delivered */ f64 rtt_time; /**< RTT for sample */ - u64 tx_rate; /**< Tx pacing rate */ u32 delivered; /**< Bytes delivered in interval_time */ u32 acked_and_sacked; /**< Bytes acked + sacked now */ u32 lost; /**< Bytes lost now */ @@ -394,6 +393,7 @@ typedef struct _tcp_connection u64 delivered; /**< Total bytes delivered to peer */ u64 app_limited; /**< Delivered when app-limited detected */ f64 delivered_time; /**< Time last bytes were acked */ + f64 first_tx_time; /**< Send time for recently delivered/sent */ tcp_byte_tracker_t *bt; /**< Tx byte tracker */ tcp_errors_t errors; /**< Soft connection errors */ diff --git a/src/vnet/tcp/tcp_bt.c b/src/vnet/tcp/tcp_bt.c index fe007543cd0..b550fdd65dd 100644 --- a/src/vnet/tcp/tcp_bt.c +++ b/src/vnet/tcp/tcp_bt.c @@ -241,8 +241,8 @@ tcp_bt_alloc_tx_sample (tcp_connection_t * tc, u32 min_seq) bts = bt_alloc_sample (tc->bt, min_seq); bts->delivered = tc->delivered; bts->delivered_time = tc->delivered_time; - bts->tx_rate = transport_connection_tx_pacer_rate (&tc->connection); bts->tx_time = tcp_time_now_us (tc->c_thread_index); + bts->first_tx_time = tc->first_tx_time; bts->flags |= tc->app_limited ? TCP_BTS_IS_APP_LIMITED : 0; return bts; } @@ -270,7 +270,10 @@ tcp_bt_track_tx (tcp_connection_t * tc) u32 bts_index; if (tc->snd_una == tc->snd_nxt) - tc->delivered_time = tcp_time_now_us (tc->c_thread_index); + { + tc->delivered_time = tcp_time_now_us (tc->c_thread_index); + tc->first_tx_time = tc->delivered_time; + } bts = tcp_bt_alloc_tx_sample (tc, tc->snd_nxt); bts_index = bt_sample_index (bt, bts); @@ -421,9 +424,10 @@ tcp_bt_sample_to_rate_sample (tcp_connection_t * tc, tcp_bt_sample_t * bts, rs->prior_delivered = bts->delivered; rs->prior_time = bts->delivered_time; + rs->interval_time = bts->tx_time - bts->first_tx_time; rs->rtt_time = bts->tx_time; - rs->tx_rate = bts->tx_rate; rs->flags = bts->flags; + tc->first_tx_time = bts->tx_time; } static void @@ -529,7 +533,8 @@ tcp_bt_sample_delivery_rate (tcp_connection_t * tc, tcp_rate_sample_t * rs) if (tc->sack_sb.last_sacked_bytes) tcp_bt_walk_samples_ooo (tc, rs); - rs->interval_time = tc->delivered_time - rs->prior_time; + rs->interval_time = clib_max (tc->delivered_time - rs->prior_time, + rs->interval_time); rs->delivered = tc->delivered - rs->prior_delivered; rs->rtt_time = tc->delivered_time - rs->rtt_time; rs->acked_and_sacked = delivered; |