netdev - Re: [PATCH net-next] Revert "net: init sk

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Message-ID: <CALOAHbAEO=XmxPoV0gyeqYAAzEE5WtaT9uh5TUSAJ0Q+XuHZ8g@mail.gmail.com>
Date:   Tue, 24 Apr 2018 23:59:11 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] Revert "net: init sk_cookie for inet socket"

On Tue, Apr 24, 2018 at 11:49 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
>
> On 04/24/2018 08:12 AM, Yafang Shao wrote:
>> On Tue, Apr 24, 2018 at 8:38 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>>>
>>>
>>> On 04/24/2018 05:05 AM, Yafang Shao wrote:
>>>> This revert commit <c6849a3ac17e> ("net: init sk_cookie for inet socket")
>>>>
>>>> Per discussion with Eric.
>>>>
>>>
>>> I suggest you include a bit more details, about cache line false sharing.
>>>
>>
>> Coud we adjust the struct common to avoid such kind of cache line
>> false sharing ?
>> I mean removing "atomic64_t  skc_cookie;" from struct sock_common and
>> place it in struct inet_sock ?
>
> The false sharing is not there, it is on net->cookie_gen
>

Yes.
This is the current issue.
May be we should adjust struct net as well.

Regarding sk_cookie, as it is only used by inet_sock now, may be it is
better placed in srtuct inet_sock ?

Thanks
Yafang