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| author | David Howells <dhowells@redhat.com> | 2017-06-14 17:56:50 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-14 15:42:45 -0400 |
| commit | f7aec129a356ad049edddcb7e77b04a474fcf41f (patch) | |
| tree | 103d3fb8a7c99b6c9ebaeaf20d2c891174d72f48 /net/rxrpc/conn_client.c | |
| parent | 0430a26054733de6e7884a4d2872613f9d8b9a66 (diff) | |
| download | lwn-f7aec129a356ad049edddcb7e77b04a474fcf41f.tar.gz lwn-f7aec129a356ad049edddcb7e77b04a474fcf41f.zip | |
rxrpc: Cache the congestion window setting
Cache the congestion window setting that was determined during a call's
transmission phase when it finishes so that it can be used by the next call
to the same peer, thereby shortcutting the slow-start algorithm.
The value is stored in the rxrpc_peer struct and is accessed without
locking. Each call takes the value that happens to be there when it starts
and just overwrites the value when it finishes.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rxrpc/conn_client.c')
| -rw-r--r-- | net/rxrpc/conn_client.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/rxrpc/conn_client.c b/net/rxrpc/conn_client.c index dd8bb919c15a..eb2157680399 100644 --- a/net/rxrpc/conn_client.c +++ b/net/rxrpc/conn_client.c @@ -292,6 +292,12 @@ static int rxrpc_get_client_conn(struct rxrpc_call *call, if (!cp->peer) goto error; + call->cong_cwnd = cp->peer->cong_cwnd; + if (call->cong_cwnd >= call->cong_ssthresh) + call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; + else + call->cong_mode = RXRPC_CALL_SLOW_START; + /* If the connection is not meant to be exclusive, search the available * connections to see if the connection we want to use already exists. */ |