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Date: Mon, 30 Jun 2014 17:53:01 +0200 From: Philipp Reisner <philipp.reisner@...bit.com> To: linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk> Cc: drbd-dev@...ts.linbit.com Subject: [PATCH 12/18] drbd: trigger tcp_push_pending_frames() for PING and PING_ACK From: Lars Ellenberg <lars.ellenberg@...bit.com> 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@...bit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@...bit.com> --- drivers/block/drbd/drbd_main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 8e0813d..77d34a6 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; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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