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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>
This commit is contained in:
Chuck Lever 2019-02-11 11:25:41 -05:00 committed by Anna Schumaker
parent 35e77d21ba
commit 2c94b8eca1
1 changed files with 4 additions and 3 deletions
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7
net/sunrpc/clnt.c
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@ -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);