linux-kernel - Re: [PATCH] net: hisilicon: Fix ping latency when deal with high throughput

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Message-Id: <20191026.112235.711416398803098524.davem@davemloft.net>
Date:   Sat, 26 Oct 2019 11:22:35 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     xiaojiangfeng@...wei.com
Cc:     yisen.zhuang@...wei.com, salil.mehta@...wei.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        leeyou.li@...wei.com, zhanghan23@...wei.com, nixiaoming@...wei.com,
        zhangqiang.cn@...ilicon.com, dingjingcheng@...ilicon.com
Subject: Re: [PATCH] net: hisilicon: Fix ping latency when deal with high
 throughput

From: Jiangfeng Xiao <xiaojiangfeng@...wei.com>
Date: Sat, 26 Oct 2019 16:49:39 +0800

> diff --git a/drivers/net/ethernet/hisilicon/hip04_eth.c b/drivers/net/ethernet/hisilicon/hip04_eth.c
> index ad6d912..78f338a 100644
> --- a/drivers/net/ethernet/hisilicon/hip04_eth.c
> +++ b/drivers/net/ethernet/hisilicon/hip04_eth.c
> @@ -575,7 +575,7 @@ static int hip04_rx_poll(struct napi_struct *napi, int budget)
>  	struct hip04_priv *priv = container_of(napi, struct hip04_priv, napi);
>  	struct net_device *ndev = priv->ndev;
>  	struct net_device_stats *stats = &ndev->stats;
> -	unsigned int cnt = hip04_recv_cnt(priv);
> +	static unsigned int cnt_remaining;

There is no way a piece of software state should be system wide, this is
a per device instance value.