netdev - Re: [PATCH][net-next] net: slightly optimize eth_type

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Message-Id: <20181115.151131.596213640354724307.davem@davemloft.net>
Date:   Thu, 15 Nov 2018 15:11:31 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     lirongqing@...du.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH][net-next] net: slightly optimize eth_type_trans

From: Li RongQing <lirongqing@...du.com>
Date: Tue, 13 Nov 2018 09:34:31 +0800

> netperf udp stream shows that eth_type_trans takes certain cpu,
> so adjust the mac address check order, and firstly check if it
> is device address, and only check if it is multicast address
> only if not the device address.
> 
> After this change:
> To unicast, and skb dst mac is device mac, this is most of time
> reduce a comparision
> To unicast, and skb dst mac is not device mac, nothing change
> To multicast, increase a comparision
> 
> Before:
> 1.03%  [kernel]          [k] eth_type_trans
> 
> After:
> 0.78%  [kernel]          [k] eth_type_trans
> 
> Signed-off-by: Zhang Yu <zhangyu31@...du.com>
> Signed-off-by: Li RongQing <lirongqing@...du.com>

Applied.