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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2014-02-05 09:13:53 +0400 |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2014-07-10 20:34:52 +0400 |
| commit | 123ff122ade4b22961f2c244c44966d52c2a7ca5 (patch) | |
| tree | ebf740d3ca5ef39555ef4bebfd60e776140fbf32 | |
| parent | 66ce6dbce2efa31d038a3148fa99bd86abd2203f (diff) | |
| download | linux-123ff122ade4b22961f2c244c44966d52c2a7ca5.tar.xz | |
drbd: trigger tcp_push_pending_frames() for PING and PING_ACK
This should reduce latency for such in-DRBD-protocol "pings",
and may help reduce spurious disconnect/reconnect cycles due to
"PingAck did not arrive in time."
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| -rw-r--r-- | drivers/block/drbd/drbd_main.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 8e0813ddf72a..77d34a61bb58 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -662,6 +662,11 @@ static int __send_command(struct drbd_connection *connection, int vnr, msg_flags); if (data && !err) err = drbd_send_all(connection, sock->socket, data, size, 0); + /* DRBD protocol "pings" are latency critical. + * This is supposed to trigger tcp_push_pending_frames() */ + if (!err && (cmd == P_PING || cmd == P_PING_ACK)) + drbd_tcp_nodelay(sock->socket); + return err; } |