From: Yongseok Koh <yskoh@mellanox.com>
To: "Nélio Laranjeiro" <nelio.laranjeiro@6wind.com>
Cc: ferruh.yigit@intel.com, dev@dpdk.org, adrien.mazarguil@6wind.com
Subject: Re: [dpdk-dev] [PATCH 2/5] net/mlx5: free buffers in bulk on Tx completion
Date: Fri, 30 Jun 2017 10:49:56 -0700 [thread overview]
Message-ID: <20170630174956.GA911@yongseok-MBP.local> (raw)
In-Reply-To: <20170630124321.GP18305@autoinstall.dev.6wind.com>
On Fri, Jun 30, 2017 at 02:43:21PM +0200, Nélio Laranjeiro wrote:
> On Fri, Jun 30, 2017 at 02:30:47PM +0200, Nélio Laranjeiro wrote:
> > On Wed, Jun 28, 2017 at 04:04:00PM -0700, Yongseok Koh wrote:
> > > When processing Tx completion, it is more efficient to free buffers in bulk
> > > using rte_mempool_put_bulk() if buffers are from a same mempool.
> > >
> > > Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
> > > ---
> > > drivers/net/mlx5/mlx5_rxtx.c | 36 +++++++++++++++++++++++++++---------
> > > 1 file changed, 27 insertions(+), 9 deletions(-)
> > >
> > > diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
> > > index 43db06ad8..d81d630f7 100644
> > > --- a/drivers/net/mlx5/mlx5_rxtx.c
> > > +++ b/drivers/net/mlx5/mlx5_rxtx.c
> > > @@ -264,6 +264,8 @@ txq_complete(struct txq *txq)
> > > uint16_t cq_ci = txq->cq_ci;
> > > volatile struct mlx5_cqe *cqe = NULL;
> > > volatile struct mlx5_wqe_ctrl *ctrl;
> > > + struct rte_mbuf *m, *free[elts_n];
> > > + unsigned int blk_n = 0;
> > >
> > > do {
> > > volatile struct mlx5_cqe *tmp;
> > > @@ -296,21 +298,37 @@ txq_complete(struct txq *txq)
> > > assert((elts_tail & elts_m) < (1 << txq->wqe_n));
> > > /* Free buffers. */
> > > while (elts_free != elts_tail) {
> > > - struct rte_mbuf *elt = (*txq->elts)[elts_free & elts_m];
> > > - struct rte_mbuf *elt_next =
> > > - (*txq->elts)[(elts_free + 1) & elts_m];
> > > -
> > > + m = rte_pktmbuf_prefree_seg((*txq->elts)[elts_free++ & elts_m]);
> > > + if (likely(m != NULL)) {
> > > + if (blk_n) {
> > > + if (likely(m->pool == free[0]->pool)) {
> > > + free[blk_n++] = m;
> > > + } else {
> > > + rte_mempool_put_bulk(
> > > + free[0]->pool,
> > > + (void *)free,
> > > + blk_n);
> >
> > The indentation is strange here, free[0] should be on the same line as
> > rte_mempool_put_bulk.
> >
> > > + free[0] = m;
> > > + blk_n = 1;
> > > + }
> > > + } else {
> > > + free[0] = m;
> > > + blk_n = 1;
> > > + }
> > > + }
> >
> > This loop could be smaller, blk_n can only be equal to 0 in the first
> > iteration, otherwise is >= 1.
> > The first if statement can be merged with the second one:
> >
> > if (likely(m != NULL)) {
> > if (likely(blk_n && m->pool == free[0]->pool)) {
>
> This condition is a wrong also, it should be !blk_n || (m->pool ...
>
> Why don't you keep a pointer to the mpool (e.g. m->pool == pool)? It
> seems to cost a little to deference two pointers to reach the pool's
> one.
Good point. The following will be the final streamlined code.
/* Free buffers. */
while (elts_free != elts_tail) {
m = rte_pktmbuf_prefree_seg((*txq->elts)[elts_free++ & elts_m]);
if (likely(m != NULL)) {
if (likely(m->pool == pool)) {
free[blk_n++] = m;
} else {
if (likely(pool != NULL))
rte_mempool_put_bulk(pool,
(void *)free,
blk_n);
free[0] = m;
pool = m->pool;
blk_n = 1;
}
}
}
if (blk_n)
rte_mempool_put_bulk(pool, (void *)free, blk_n);
Thanks,
Yongseok
next prev parent reply other threads:[~2017-06-30 17:50 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-28 23:03 [dpdk-dev] [PATCH 0/5] net/mlx5: add vectorized Rx/Tx burst for x86 Yongseok Koh
2017-06-28 23:03 ` [dpdk-dev] [PATCH 1/5] net/mlx5: change indexing for Tx SW ring Yongseok Koh
2017-06-30 12:20 ` Nélio Laranjeiro
2017-06-28 23:04 ` [dpdk-dev] [PATCH 2/5] net/mlx5: free buffers in bulk on Tx completion Yongseok Koh
2017-06-30 12:30 ` Nélio Laranjeiro
2017-06-30 12:43 ` Nélio Laranjeiro
2017-06-30 17:49 ` Yongseok Koh [this message]
2017-06-28 23:04 ` [dpdk-dev] [PATCH 3/5] net/mlx5: use buffer address for LKEY search Yongseok Koh
2017-06-30 13:01 ` Nélio Laranjeiro
2017-06-30 18:58 ` Yongseok Koh
2017-06-28 23:04 ` [dpdk-dev] [PATCH 4/5] net/mlx5: select Rx/Tx callbacks when starting device Yongseok Koh
2017-06-30 13:02 ` Nélio Laranjeiro
2017-06-28 23:04 ` [dpdk-dev] [PATCH 5/5] net/mlx5: add vectorized Rx/Tx burst for SSE4.1 Yongseok Koh
2017-06-30 19:23 ` [dpdk-dev] [PATCH v2 0/5] net/mlx5: add vectorized Rx/Tx burst for x86 Yongseok Koh
2017-06-30 19:23 ` [dpdk-dev] [PATCH v2 1/5] net/mlx5: change indexing for Tx SW ring Yongseok Koh
2017-07-03 13:48 ` Nélio Laranjeiro
2017-06-30 19:23 ` [dpdk-dev] [PATCH v2 2/5] net/mlx5: free buffers in bulk on Tx completion Yongseok Koh
2017-07-03 13:58 ` Nélio Laranjeiro
2017-06-30 19:23 ` [dpdk-dev] [PATCH v2 3/5] net/mlx5: use buffer address for LKEY search Yongseok Koh
2017-07-03 14:06 ` Nélio Laranjeiro
2017-07-03 20:54 ` Yongseok Koh
2017-07-04 6:54 ` Nélio Laranjeiro
2017-06-30 19:23 ` [dpdk-dev] [PATCH v2 4/5] net/mlx5: select Rx/Tx callbacks when starting device Yongseok Koh
2017-07-03 13:49 ` Nélio Laranjeiro
2017-06-30 19:23 ` [dpdk-dev] [PATCH v2 5/5] net/mlx5: add vectorized Rx/Tx burst for SSE4.1 Yongseok Koh
2017-07-03 23:54 ` Thomas Monjalon
2017-07-04 8:58 ` Nélio Laranjeiro
2017-07-05 0:38 ` Yongseok Koh
2017-07-05 8:21 ` Nélio Laranjeiro
2017-07-05 17:41 ` Yongseok Koh
2017-06-30 21:28 ` [dpdk-dev] [PATCH v2 0/5] net/mlx5: add vectorized Rx/Tx burst for x86 Bruce Richardson
2017-07-05 18:12 ` [dpdk-dev] [PATCH v3 " Yongseok Koh
2017-07-05 18:12 ` [dpdk-dev] [PATCH v3 1/5] net/mlx5: change indexing for Tx SW ring Yongseok Koh
2017-07-05 18:12 ` [dpdk-dev] [PATCH v3 2/5] net/mlx5: free buffers in bulk on Tx completion Yongseok Koh
2017-07-05 18:12 ` [dpdk-dev] [PATCH v3 3/5] net/mlx5: use buffer address for LKEY search Yongseok Koh
2017-07-05 18:12 ` [dpdk-dev] [PATCH v3 4/5] net/mlx5: select Rx/Tx callbacks when starting device Yongseok Koh
2017-07-06 7:17 ` Nélio Laranjeiro
2017-07-05 18:12 ` [dpdk-dev] [PATCH v3 5/5] net/mlx5: add vectorized Rx/Tx burst for SSE4.1 Yongseok Koh
2017-07-05 22:58 ` Yongseok Koh
2017-07-06 7:16 ` Nélio Laranjeiro
2017-07-06 9:58 ` Ferruh Yigit
2017-07-06 18:41 ` [dpdk-dev] [PATCH v4 0/5] net/mlx5: add vectorized Rx/Tx burst for x86 Yongseok Koh
2017-07-06 18:41 ` [dpdk-dev] [PATCH v4 1/5] net/mlx5: change indexing for Tx SW ring Yongseok Koh
2017-07-06 18:41 ` [dpdk-dev] [PATCH v4 2/5] net/mlx5: free buffers in bulk on Tx completion Yongseok Koh
2017-07-06 18:41 ` [dpdk-dev] [PATCH v4 3/5] net/mlx5: use buffer address for LKEY search Yongseok Koh
2017-07-06 18:41 ` [dpdk-dev] [PATCH v4 4/5] net/mlx5: select Rx/Tx callbacks when starting device Yongseok Koh
2017-07-06 18:41 ` [dpdk-dev] [PATCH v4 5/5] net/mlx5: add vectorized Rx/Tx burst for x86 Yongseok Koh
2017-07-07 9:58 ` [dpdk-dev] [PATCH v4 0/5] " Ferruh Yigit
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