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Thank you, Honnappa > -----Original Message----- > From: Honnappa Nagarahalli > Sent: Monday, September 28, 2020 2:03 PM > To: dev@dpdk.org; Honnappa Nagarahalli ; > Phil Yang ; jgrajcia@cisco.com; ferruh.yigit@intel.com > Cc: nd ; stable@dpdk.org > Subject: [PATCH v2 1/8] net/memif: do not update local copy of tail in tx > function >=20 > In the case of S2M queues, the receiver synchronizes with the sender (i.e= . > informs of the packets it has received) using ring->tail. > Hence, the sender does not need to update last_tail. >=20 > In the case of M2S queues, the receiver uses last_tail to keep track of t= he > descriptors it has received. The sender is not required to update the las= t_tail. > Updating the last_tail makes it a shared variable between the transmitter= and > receiver affecting the performance. >=20 > Fixes: 09c7e63a71f9 ("net/memif: introduce memory interface PMD") > Cc: jgrajcia@cisco.com > Cc: stable@dpdk.org >=20 > Signed-off-by: Honnappa Nagarahalli > Reviewed-by: Phil Yang > Reviewed-by: Ruifeng Wang > --- > drivers/net/memif/rte_eth_memif.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) >=20 > diff --git a/drivers/net/memif/rte_eth_memif.c > b/drivers/net/memif/rte_eth_memif.c > index a19c0f3e6..130099f2e 100644 > --- a/drivers/net/memif/rte_eth_memif.c > +++ b/drivers/net/memif/rte_eth_memif.c > @@ -580,12 +580,10 @@ eth_memif_tx(void *queue, struct rte_mbuf **bufs, > uint16_t nb_pkts) > ring_size =3D 1 << mq->log2_ring_size; > mask =3D ring_size - 1; >=20 > - n_free =3D __atomic_load_n(&ring->tail, __ATOMIC_ACQUIRE) - mq- > >last_tail; > - mq->last_tail +=3D n_free; > - > if (type =3D=3D MEMIF_RING_S2M) { > slot =3D __atomic_load_n(&ring->head, __ATOMIC_ACQUIRE); > - n_free =3D ring_size - slot + mq->last_tail; > + n_free =3D ring_size - slot + > + __atomic_load_n(&ring->tail, > __ATOMIC_ACQUIRE); > } else { > slot =3D __atomic_load_n(&ring->tail, __ATOMIC_ACQUIRE); > n_free =3D __atomic_load_n(&ring->head, __ATOMIC_ACQUIRE) > - slot; > -- > 2.17.1