[dpdk-dev] [PATCH v2] mbuf: reduce pktmbuf init cycles

[Jerin Jacob]

There is no need for initializing the complete
packet buffer with zero as the packet data area will be
overwritten by the NIC Rx HW anyway.

The testpmd configures the packet mempool
with around 180k buffers with
2176B size. In existing scheme, the init routine
needs to memset around ~370MB vs the proposed scheme
requires only around ~22MB on 128B cache aligned system.

Useful in running DPDK in HW simulators/emulators,
where millions of cycles have an impact on boot time.

Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
---
v2:
- Removed RTE_PKTMBUF_HEADROOM from the memset area(Olivier)
---
 lib/librte_mbuf/rte_mbuf.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index 0e3e36a58..ab436b9da 100644
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -131,8 +131,7 @@ rte_pktmbuf_init(struct rte_mempool *mp,
 	RTE_ASSERT(mp->elt_size >= mbuf_size);
 	RTE_ASSERT(buf_len <= UINT16_MAX);
 
-	memset(m, 0, mp->elt_size);
-
+	memset(m, 0, mbuf_size);
 	/* start of buffer is after mbuf structure and priv data */
 	m->priv_size = priv_size;
 	m->buf_addr = (char *)m + mbuf_size;
-- 
2.13.2