diff options
| author | David Howells <dhowells@redhat.com> | 2022-11-11 13:47:35 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2022-12-01 13:36:42 +0000 |
| commit | 32cf8edb079a6a687a2b5dba39a813a0bbd0ddf9 (patch) | |
| tree | acbf8a435043daa16df69c2d9f2fd3ea769cc788 /net/rxrpc/input.c | |
| parent | 3dd9c8b5f09fd24652729a3da5c5efa3ec2c4590 (diff) | |
rxrpc: Trace/count transmission underflows and cwnd resets
Add a tracepoint to log when a cwnd reset occurs due to lack of
transmission on a call.
Add stat counters to count transmission underflows (ie. when we have tx
window space, but sendmsg doesn't manage to keep up), cwnd resets and
transmission failures.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Diffstat (limited to 'net/rxrpc/input.c')
| -rw-r--r-- | net/rxrpc/input.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c index dd2ac5d55e1c..2988e3d0c1f6 100644 --- a/net/rxrpc/input.c +++ b/net/rxrpc/input.c @@ -27,6 +27,7 @@ static void rxrpc_congestion_management(struct rxrpc_call *call, enum rxrpc_congest_change change = rxrpc_cong_no_change; unsigned int cumulative_acks = call->cong_cumul_acks; unsigned int cwnd = call->cong_cwnd; + ktime_t now; bool resend = false; summary->flight_size = @@ -59,13 +60,15 @@ static void rxrpc_congestion_management(struct rxrpc_call *call, /* If we haven't transmitted anything for >1RTT, we should reset the * congestion management state. */ + now = ktime_get_real(); if ((call->cong_mode == RXRPC_CALL_SLOW_START || call->cong_mode == RXRPC_CALL_CONGEST_AVOIDANCE) && ktime_before(ktime_add_us(call->tx_last_sent, - call->peer->srtt_us >> 3), - ktime_get_real()) + call->peer->srtt_us >> 3), now) ) { + trace_rxrpc_reset_cwnd(call, now); change = rxrpc_cong_idle_reset; + rxrpc_inc_stat(call->rxnet, stat_tx_data_cwnd_reset); summary->mode = RXRPC_CALL_SLOW_START; if (RXRPC_TX_SMSS > 2190) summary->cwnd = 2; |