netdev - Re: [PATCH][net-next] vxlan: reduce dirty cache line in vxlan_find

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Message-Id: <20180829.220815.1265477887800729259.davem@davemloft.net>
Date:   Wed, 29 Aug 2018 22:08:15 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lirongqing@...du.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH][net-next] vxlan: reduce dirty cache line in
 vxlan_find_mac

From: Li RongQing <lirongqing@...du.com>
Date: Wed, 29 Aug 2018 11:52:10 +0800

> vxlan_find_mac() unconditionally set f->used for every packet,
> this causes a cache miss for every packet, since remote, hlist
> and used of vxlan_fdb share the same cache line, which are
> accessed when send every packets.
> 
> so f->used is set only if not equal to jiffies, to reduce dirty
> cache line times, this gives 3% speed-up with small packets.
> 
> Signed-off-by: Zhang Yu <zhangyu31@...du.com>
> Signed-off-by: Li RongQing <lirongqing@...du.com>

Applied.