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xprtrdma: More Send completion batching

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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>
This commit is contained in:
Chuck Lever 2019-04-24 09:39:59 -04:00 committed by Anna Schumaker
parent dbcc53a52d
commit c209e49cea
2 changed files with 1 additions and 13 deletions
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4
net/sunrpc/xprtrdma/verbs.c
View File

@ -521,9 +521,7 @@ rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
ep->rep_attr.cap.max_send_sge,
ep->rep_attr.cap.max_recv_sge);
/* set trigger for requesting send completion */
ep->rep_send_batch = min_t(unsigned int, RPCRDMA_MAX_SEND_BATCH,
cdata->max_requests >> 2);
ep->rep_send_batch = cdata->max_requests >> 3;
ep->rep_send_count = ep->rep_send_batch;
init_waitqueue_head(&ep->rep_connect_wait);
ep->rep_receive_count = 0;

10
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -232,16 +232,6 @@ struct rpcrdma_sendctx {
struct ib_sge sc_sges[];
};
/* Limit the number of SGEs that can be unmapped during one
* Send completion. This caps the amount of work a single
* completion can do before returning to the provider.
*
* Setting this to zero disables Send completion batching.
*/
enum {
RPCRDMA_MAX_SEND_BATCH = 7,
};
/*
* struct rpcrdma_mr - external memory region metadata
*