netdev - Re: [PATCH net-next] neighbor: Add protocol attribute

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Date:   Fri, 07 Dec 2018 15:45:53 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     dsahern@...il.com, dsahern@...nel.org, netdev@...r.kernel.org,
        roopa@...ulusnetworks.com
Subject: Re: [PATCH net-next] neighbor: Add protocol attribute

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 7 Dec 2018 15:03:04 -0800

> On 12/07/2018 02:24 PM, David Ahern wrote:
>> On 12/7/18 3:20 PM, Eric Dumazet wrote:
>> 
>> /* --- cacheline 3 boundary (192 bytes) --- */
>> struct hh_cache            hh;                   /*   192    48 */
>> 
>> ...
>> 
>> but does not change the actual allocation size which is rounded to 512.
>> 
> 
> I have not talked about the allocation size, but alignment of ->ha field,
> which is kind of assuming long alignment, in a strange way.

Right, neigh->ha[] should probably be kept 8-byte aligned.