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xprtrdma: More Send completion batching
Instead of using a fixed number, allow the amount of Send completion batching to vary based on the client's maximum credit limit. - A larger default gives a small boost to IOPS throughput - Reducing it based on max_requests gives a safe result when the max credit limit is cranked down (eg. when the device has a small max_qp_wr). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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@ -521,9 +521,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
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ep->rep_attr.cap.max_send_sge,
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ep->rep_attr.cap.max_recv_sge);
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/* set trigger for requesting send completion */
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ep->rep_send_batch = min_t(unsigned int, RPCRDMA_MAX_SEND_BATCH,
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cdata->max_requests >> 2);
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ep->rep_send_batch = cdata->max_requests >> 3;
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ep->rep_send_count = ep->rep_send_batch;
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init_waitqueue_head(&ep->rep_connect_wait);
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ep->rep_receive_count = 0;
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@ -232,16 +232,6 @@ struct rpcrdma_sendctx {
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struct ib_sge sc_sges[];
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};
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/* Limit the number of SGEs that can be unmapped during one
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* Send completion. This caps the amount of work a single
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* completion can do before returning to the provider.
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*
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* Setting this to zero disables Send completion batching.
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*/
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enum {
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RPCRDMA_MAX_SEND_BATCH = 7,
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};
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/*
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* struct rpcrdma_mr - external memory region metadata
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*
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