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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>
This commit is contained in:
Chuck Lever 2010-05-07 13:34:27 -04:00 committed by Trond Myklebust
parent 9bc4e3ca46
commit bbc72cea58
3 changed files with 4 additions and 11 deletions
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1
include/linux/sunrpc/xprt.h
View File

@ -293,7 +293,6 @@ void xprt_set_retrans_timeout_rtt(struct rpc_task *task);
void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action);
void xprt_write_space(struct rpc_xprt *xprt);
void xprt_update_rtt(struct rpc_task *task);
void xprt_adjust_cwnd(struct rpc_task *task, int result);
struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
void xprt_complete_rqst(struct rpc_task *task, int copied);

13
net/sunrpc/xprt.c
View File

@ -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;

1
net/sunrpc/xprtsock.c
View File

@ -844,7 +844,6 @@ static void xs_udp_data_ready(struct sock *sk, int len)
dst_confirm(skb_dst(skb));
xprt_adjust_cwnd(task, copied);
xprt_update_rtt(task);
xprt_complete_rqst(task, copied);
out_unlock: