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SUNRPC: Set TCP_CORK until the transmit queue is empty

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When we have multiple RPC requests queued up, it makes sense to set the
TCP_CORK option while the transmit queue is non-empty.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2021-02-09 16:04:15 -05:00
parent 86438186a7
commit d737e5d418
3 changed files with 7 additions and 1 deletions
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1
include/linux/sunrpc/xprt.h
View File

@ -247,6 +247,7 @@ struct rpc_xprt {
struct rpc_task * snd_task; /* Task blocked in send */
struct list_head xmit_queue; /* Send queue */
atomic_long_t xmit_queuelen;
struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */
#if defined(CONFIG_SUNRPC_BACKCHANNEL)

2
net/sunrpc/xprt.c
View File

@ -1352,6 +1352,7 @@ xprt_request_enqueue_transmit(struct rpc_task *task)
list_add_tail(&req->rq_xmit, &xprt->xmit_queue);
INIT_LIST_HEAD(&req->rq_xmit2);
out:
atomic_long_inc(&xprt->xmit_queuelen);
set_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate);
spin_unlock(&xprt->queue_lock);
}
@ -1381,6 +1382,7 @@ xprt_request_dequeue_transmit_locked(struct rpc_task *task)
}
} else
list_del(&req->rq_xmit2);
atomic_long_dec(&req->rq_xprt->xmit_queuelen);
}
/**

5
net/sunrpc/xprtsock.c
View File

@ -1018,6 +1018,7 @@ static int xs_tcp_send_request(struct rpc_rqst *req)
* to cope with writespace callbacks arriving _after_ we have
* called sendmsg(). */
req->rq_xtime = ktime_get();
tcp_sock_set_cork(transport->inet, true);
while (1) {
status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
transport->xmit.offset, rm, &sent);
@ -1032,6 +1033,8 @@ static int xs_tcp_send_request(struct rpc_rqst *req)
if (likely(req->rq_bytes_sent >= msglen)) {
req->rq_xmit_bytes_sent += transport->xmit.offset;
transport->xmit.offset = 0;
if (atomic_long_read(&xprt->xmit_queuelen) == 1)
tcp_sock_set_cork(transport->inet, false);
return 0;
}
@ -2163,6 +2166,7 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
}
xs_tcp_set_socket_timeouts(xprt, sock);
tcp_sock_set_nodelay(sk);
write_lock_bh(&sk->sk_callback_lock);
@ -2177,7 +2181,6 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
/* socket options */
sock_reset_flag(sk, SOCK_LINGER);
tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
xprt_clear_connected(xprt);