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IB/hfi1: Add running average for adaptive pio

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The adaptive PIO implementation only considers the current packet size
when deciding between SDMA and pio for a packet.

This causes credit return forces if small and large packets are
interleaved.

Add a running average to avoid costly credit forces so that a large
sequence of small packets is required to go below the threshold that
chooses pio.

Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Mike Marciniszyn 2019-02-26 08:46:16 -08:00 committed by Jason Gunthorpe
parent 19b1a294b0
commit 270a9833b2
3 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/infiniband/hw/hfi1/qp.c
View File

@ -742,6 +742,8 @@ void *qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp)
iowait_wakeup,
iowait_sdma_drained,
hfi1_init_priority);
/* Init to a value to start the running average correctly */
priv->s_running_pkt_size = piothreshold / 2;
return priv;
}

7
drivers/infiniband/hw/hfi1/verbs.c
View File

@ -1223,15 +1223,16 @@ static inline send_routine get_send_routine(struct rvt_qp *qp,
case IB_QPT_UD:
break;
case IB_QPT_UC:
case IB_QPT_RC: {
case IB_QPT_RC:
priv->s_running_pkt_size =
(tx->s_cur_size + priv->s_running_pkt_size) / 2;
if (piothreshold &&
tx->s_cur_size <= min(piothreshold, qp->pmtu) &&
priv->s_running_pkt_size <= min(piothreshold, qp->pmtu) &&
(BIT(ps->opcode & OPMASK) & pio_opmask[ps->opcode >> 5]) &&
iowait_sdma_pending(&priv->s_iowait) == 0 &&
!sdma_txreq_built(&tx->txreq))
return dd->process_pio_send;
break;
}
default:
break;
}

1
drivers/infiniband/hw/hfi1/verbs.h
View File

@ -170,6 +170,7 @@ struct hfi1_qp_priv {
struct tid_flow_state flow_state;
struct tid_rdma_qp_params tid_rdma;
struct rvt_qp *owner;
u16 s_running_pkt_size;
u8 hdr_type; /* 9B or 16B */
struct rvt_sge_state tid_ss; /* SGE state pointer for 2nd leg */
atomic_t n_requests; /* # of TID RDMA requests in the */