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| author |   Chuck Lever <chuck.lever@oracle.com> | 2018-03-05 15:13:07 -0500 |
|---|---|---|
| committer |   Anna Schumaker <Anna.Schumaker@Netapp.com> | 2018-04-10 16:06:22 -0400 |
| commit | 78215759e20d859b8f1de7d0aebd08878fbc4eed (patch) | |
| tree | 8817e841aacc3cd1272679b0cf11345000fff89a /net/sunrpc | |
| parent | SUNRPC: Make RTT measurement more precise (Receive) (diff) | |
| download | linux-dev-78215759e20d859b8f1de7d0aebd08878fbc4eed.tar.xz linux-dev-78215759e20d859b8f1de7d0aebd08878fbc4eed.zip | |
SUNRPC: Make RTT measurement more precise (Send)
Some RPC transports have more overhead in their send_request
callouts than others. For example, for RPC-over-RDMA:
- Marshaling an RPC often has to DMA map the RPC arguments
- Registration methods perform memory registration as part of
marshaling
To capture just server and network latencies more precisely: when
sending a Call, capture the rq_xtime timestamp _after_ the transport
header has been marshaled.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/xprt.c | 1 | ||||
| -rw-r--r-- | net/sunrpc/xprtrdma/transport.c | 1 | ||||
| -rw-r--r-- | net/sunrpc/xprtsock.c | 3 |
3 files changed, 4 insertions, 1 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index cb7784c5b741..73f05a1fbc19 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -1033,7 +1033,6 @@ void xprt_transmit(struct rpc_task *task) return; connect_cookie = xprt->connect_cookie; - req->rq_xtime = ktime_get(); status = xprt->ops->send_request(task); trace_xprt_transmit(xprt, req->rq_xid, status); if (status != 0) { diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c index 67e438612c18..cc1aad325496 100644 --- a/net/sunrpc/xprtrdma/transport.c +++ b/net/sunrpc/xprtrdma/transport.c @@ -696,6 +696,7 @@ xprt_rdma_send_request(struct rpc_task *task) /* Must suppress retransmit to maintain credits */ if (rqst->rq_connect_cookie == xprt->connect_cookie) goto drop_connection; + rqst->rq_xtime = ktime_get(); __set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags); if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 61df77f41304..e3c6a3df278b 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -527,6 +527,7 @@ static int xs_local_send_request(struct rpc_task *task) xs_pktdump("packet data:", req->rq_svec->iov_base, req->rq_svec->iov_len); + req->rq_xtime = ktime_get(); status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, true, &sent); dprintk("RPC: %s(%u) = %d\n", @@ -589,6 +590,7 @@ static int xs_udp_send_request(struct rpc_task *task) if (!xprt_bound(xprt)) return -ENOTCONN; + req->rq_xtime = ktime_get(); status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, xdr, req->rq_bytes_sent, true, &sent); @@ -678,6 +680,7 @@ static int xs_tcp_send_request(struct rpc_task *task) /* Continue transmitting the packet/record. We must be careful * to cope with writespace callbacks arriving _after_ we have * called sendmsg(). */ + req->rq_xtime = ktime_get(); while (1) { sent = 0; status = xs_sendpages(transport->sock, NULL, 0, xdr, |