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SUNRPC: Use au_rslack when computing reply buffer size
au_rslack is significantly smaller than (au_cslack << 2). Using that value results in smaller receive buffers. In some cases this eliminates an extra segment in Reply chunks (RPC/RDMA). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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35e77d21ba
commit
2c94b8eca1
1 changed files with 4 additions and 3 deletions
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@ -1690,7 +1690,7 @@ call_refreshresult(struct rpc_task *task)
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static void
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call_allocate(struct rpc_task *task)
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{
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unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;
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const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth;
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struct rpc_rqst *req = task->tk_rqstp;
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struct rpc_xprt *xprt = req->rq_xprt;
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const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
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@ -1715,9 +1715,10 @@ call_allocate(struct rpc_task *task)
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* and reply headers, and convert both values
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* to byte sizes.
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*/
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req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
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req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) +
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proc->p_arglen;
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req->rq_callsize <<= 2;
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req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
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req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + proc->p_replen;
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req->rq_rcvsize <<= 2;
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status = xprt->ops->buf_alloc(task);
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