From cb327a78021c5f3574a14dac4844d7b1b640d4f1 Mon Sep 17 00:00:00 2001 From: Jerin Jacob Date: Tue, 27 Jun 2017 17:27:51 +0530 Subject: [PATCH] mbuf: reduce pktmbuf init cycles 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 Acked-by: Olivier Matz --- 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 0e3e36a58c..ab436b9da1 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; -- 2.20.1