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Commit 2c94b8ec authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
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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: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 35e77d21

net/sunrpc/clnt.c

+4 −3
Original line number Diff line number Diff line
@@ -1690,7 +1690,7 @@ call_refreshresult(struct rpc_task *task) 
static void

call_allocate(struct rpc_task *task)

{

	unsigned int slack = task->tk_rqstp->rq_cred->cr_auth->au_cslack;

	const struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth;

	struct rpc_rqst *req = task->tk_rqstp;

	struct rpc_xprt *xprt = req->rq_xprt;

	const struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
@@ -1715,9 +1715,10 @@ call_allocate(struct rpc_task *task) 
	 * and reply headers, and convert both values

	 * to byte sizes.

	 */

	req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;

	req->rq_callsize = RPC_CALLHDRSIZE + (auth->au_cslack << 1) +

			   proc->p_arglen;

	req->rq_callsize <<= 2;

	req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;

	req->rq_rcvsize = RPC_REPHDRSIZE + auth->au_rslack + proc->p_replen;

	req->rq_rcvsize <<= 2;



	status = xprt->ops->buf_alloc(task);