netdev - Re: something is wrong in commit 971f10eca1 - tcp: better TCP_SKB

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Message-ID: <543E5D1F.2020207@winsoft.pl>
Date:	Wed, 15 Oct 2014 13:40:15 +0200
From:	Krzysztof Kolasa <kkolasa@...soft.pl>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Cong Wang <cwang@...pensource.com>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: something is wrong in commit 971f10eca1 - tcp: better TCP_SKB_CB
 layout to reduce cache line misses

W dniu 15.10.2014 o 13:27, Eric Dumazet pisze:
> On Wed, 2014-10-15 at 12:35 +0200, Krzysztof Kolasa wrote:
>> W dniu 14.10.2014 o 23:43, Eric Dumazet pisze:
>>> On Tue, 2014-10-14 at 14:24 -0700, Cong Wang wrote:
>>>
>>>> Since we are still in merge window, I don't think we have to use
>>>> a one-line fix for a bug introduced in this merge window.
>>> You are clearly refactoring here. Its a nice cleanup.
>>>
>>> If I was the maintainer, I would prefer the one line fix.
>>>
>>> Then when net-next is open, you refactor.
>>>
>>> As I said, I wont argue, do whatever you want.
>>>
>>> Thanks
>>>
>>>
>>>
>> one-line patch not resolve problem, fix created by Cong Wang resolves
>> problem !!!
> Hmm, there should be no difference with either patch.
>
> tcp_v4_rcv()
> ...
> memmove(&TCP_SKB_CB(skb)->header.h4, IPCB(skb),
>          sizeof(struct inet_skb_parm));
> ...
> -> tcp_v4_do_rcv()
>     ->  tcp_v4_hnd_req()
>        -> cookie_v4_check(... , &TCP_SKB_CB(skb)->header.h4.opt)
>
> Hmm...
>
>

on a 32bit system, the patch did not solve the problem :(
I have exactly the same problem as before the patch

I do not understand this, perhaps the problem is hidden somewhere else,
one thing is certain after revert commit 971f10eca1 everything works 
correctly


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