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authorChuck Lever <chuck.lever@oracle.com>2010-05-07 13:34:27 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-05-14 15:09:32 -0400
commitbbc72cea58f671665b6362be0d4e391813ac0eee (patch)
treee70a35d3bc05ece4a532514893fec151aee2bd46 /net/sunrpc/xprt.c
parent9bc4e3ca46e4eb9cb434de4175c6041d00bbdca3 (diff)
SUNRPC: RPC metrics and RTT estimator should use same RTT value
Compute an RPC request's RTT once, and use that value both for reporting RPC metrics, and for adjusting the RTT context used by the RPC client's RTT estimator algorithm. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/xprt.c')
-rw-r--r--net/sunrpc/xprt.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 6c9997ef386..698c6271229 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -774,12 +774,7 @@ struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid)
}
EXPORT_SYMBOL_GPL(xprt_lookup_rqst);
-/**
- * xprt_update_rtt - update an RPC client's RTT state after receiving a reply
- * @task: RPC request that recently completed
- *
- */
-void xprt_update_rtt(struct rpc_task *task)
+static void xprt_update_rtt(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_rtt *rtt = task->tk_client->cl_rtt;
@@ -787,12 +782,10 @@ void xprt_update_rtt(struct rpc_task *task)
if (timer) {
if (req->rq_ntrans == 1)
- rpc_update_rtt(rtt, timer,
- (long)jiffies - req->rq_xtime);
+ rpc_update_rtt(rtt, timer, task->tk_rtt);
rpc_set_timeo(rtt, timer, req->rq_ntrans - 1);
}
}
-EXPORT_SYMBOL_GPL(xprt_update_rtt);
/**
* xprt_complete_rqst - called when reply processing is complete
@@ -811,6 +804,8 @@ void xprt_complete_rqst(struct rpc_task *task, int copied)
xprt->stat.recvs++;
task->tk_rtt = (long)jiffies - req->rq_xtime;
+ if (xprt->ops->timer != NULL)
+ xprt_update_rtt(task);
list_del_init(&req->rq_list);
req->rq_private_buf.len = copied;