From: Leyi Rong <leyi.rong@intel.com>
Date: Thu, 12 Nov 2020 05:51:54 +0000 (+0800)
Subject: net/iavf: fix performance drop after port reset
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=63b7be7870c1eef53808f796f815b9b34ba36325;p=dpdk.git

net/iavf: fix performance drop after port reset

Needs to reset rxq->rxrearm_start to 0 when reset_rx_queue(),
otherwise, the random value of rxrearm_start will cause performance drop
due to L3 contested accesses.

Fixes: 69dd4c3d0898 ("net/avf: enable queue and device")
Cc: stable@dpdk.org

Signed-off-by: Leyi Rong <leyi.rong@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>
---

diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c
index 8f43208c80..21d508b3f4 100644
--- a/drivers/net/iavf/iavf_rxtx.c
+++ b/drivers/net/iavf/iavf_rxtx.c
@@ -195,6 +195,7 @@ reset_rx_queue(struct iavf_rx_queue *rxq)
 	rxq->pkt_first_seg = NULL;
 	rxq->pkt_last_seg = NULL;
 	rxq->rxrearm_nb = 0;
+	rxq->rxrearm_start = 0;
 }
 
 static inline void