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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/xprtrdma | |
| parent | 0b87a46b437c1629bc7d79f3c5a0ba3608c37544 (diff) | |
| download | blackbird-obmc-linux-78215759e20d859b8f1de7d0aebd08878fbc4eed.tar.gz blackbird-obmc-linux-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/xprtrdma')
| -rw-r--r-- | net/sunrpc/xprtrdma/transport.c | 1 |
1 files changed, 1 insertions, 0 deletions
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)) |
