diff options
author | Chuck Lever <cel@netapp.com> | 2005-08-25 23:25:52 (GMT) |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2005-09-23 16:38:43 (GMT) |
commit | 1570c1e41eabf6b7031f3e4322a2cf1cbe319fee (patch) | |
tree | eee53757ac3e03d55b6c01bb0500996ba520a8bb /net/sunrpc/xprt.c | |
parent | 46c0ee8bc4ad3743de05e8b8b20201df44dcb6d3 (diff) | |
download | linux-1570c1e41eabf6b7031f3e4322a2cf1cbe319fee.tar.xz |
[PATCH] RPC: add generic interface for adjusting the congestion window
A new interface that allows transports to adjust their congestion window
using the Van Jacobson implementation in xprt.c is provided.
Test-plan:
Use WAN simulation to cause sporadic bursty packet loss. Look for
significant regression in performance or client stability.
Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/xprt.c')
-rw-r--r-- | net/sunrpc/xprt.c | 66 |
1 files changed, 26 insertions, 40 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index ffc5955..707806f 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -592,55 +592,41 @@ struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid) } /** + * 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) +{ + struct rpc_rqst *req = task->tk_rqstp; + struct rpc_rtt *rtt = task->tk_client->cl_rtt; + unsigned timer = task->tk_msg.rpc_proc->p_timer; + + if (timer) { + if (req->rq_ntrans == 1) + rpc_update_rtt(rtt, timer, + (long)jiffies - req->rq_xtime); + rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); + } +} + +/** * xprt_complete_rqst - called when reply processing is complete - * @xprt: controlling transport - * @req: RPC request that just completed + * @task: RPC request that recently completed * @copied: actual number of bytes received from the transport * + * Caller holds transport lock. */ -void xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied) -{ - struct rpc_task *task = req->rq_task; - struct rpc_clnt *clnt = task->tk_client; - - /* Adjust congestion window */ - if (!xprt->nocong) { - unsigned timer = task->tk_msg.rpc_proc->p_timer; - xprt_adjust_cwnd(task, copied); - if (timer) { - if (req->rq_ntrans == 1) - rpc_update_rtt(clnt->cl_rtt, timer, - (long)jiffies - req->rq_xtime); - rpc_set_timeo(clnt->cl_rtt, timer, req->rq_ntrans - 1); - } - } +void xprt_complete_rqst(struct rpc_task *task, int copied) +{ + struct rpc_rqst *req = task->tk_rqstp; -#ifdef RPC_PROFILE - /* Profile only reads for now */ - if (copied > 1024) { - static unsigned long nextstat; - static unsigned long pkt_rtt, pkt_len, pkt_cnt; - - pkt_cnt++; - pkt_len += req->rq_slen + copied; - pkt_rtt += jiffies - req->rq_xtime; - if (time_before(nextstat, jiffies)) { - printk("RPC: %lu %ld cwnd\n", jiffies, xprt->cwnd); - printk("RPC: %ld %ld %ld %ld stat\n", - jiffies, pkt_cnt, pkt_len, pkt_rtt); - pkt_rtt = pkt_len = pkt_cnt = 0; - nextstat = jiffies + 5 * HZ; - } - } -#endif + dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", + task->tk_pid, ntohl(req->rq_xid), copied); - dprintk("RPC: %4d has input (%d bytes)\n", task->tk_pid, copied); list_del_init(&req->rq_list); req->rq_received = req->rq_private_buf.len = copied; - - /* ... and wake up the process. */ rpc_wake_up_task(task); - return; } static void xprt_timer(struct rpc_task *task) |