netdev - Re: [PATCH v2 net-next] net: sched: use no more than one page in struct fw

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Date:	Tue, 18 Mar 2014 09:19:42 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, john.fastabend@...il.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] net: sched: use no more than one page in
 struct fw_head

On 03/17/14 at 08:20pm, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> In commit b4e9b520ca5d ("[NET_SCHED]: Add mask support to fwmark
> classifier") Patrick added an u32 field in fw_head, making it slightly
> bigger than one page.
> 
> Lets use 256 slots to make fw_hash() more straight forward, and move
> @mask to the beginning of the structure as we often use a small number
> of skb->mark. @mask and first hash buckets share the same cache line.
> 
> This brings back the memory usage to less than 4000 bytes, and permits
> John to add a rcu_head at the end of the structure later without any
> worry.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Thomas Graf <tgraf@...g.ch>
> Cc: John Fastabend <john.fastabend@...il.com>

Acked-by: Thomas Graf <tgraf@...g.ch>
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