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Date:	Tue, 14 Oct 2014 11:59:25 -0700
From:	Cong Wang <>
To:	Krzysztof Kolasa <>
Cc:	Eric Dumazet <>,
	netdev <>,,
	David Miller <>
Subject: Re: something is wrong in commit 971f10eca1 - tcp: better TCP_SKB_CB
 layout to reduce cache line misses

On Tue, Oct 14, 2014 at 6:25 AM, Krzysztof Kolasa <> wrote:
> W dniu 14.10.2014 o 02:09, Cong Wang pisze:
>> On Mon, Oct 13, 2014 at 4:59 PM, Cong Wang <> wrote:
>>> Probably not related with this bug, but with regarding to the
>>> offending commit, what's the point of the memmove() in tcp_v4_rcv()
>>> since ip_rcv() already clears IPCB()?
>> Oh, ip options are actually saved in ip_rcv_finish()... Hmm, looks scary
>> to play with variable-length array with memmove()....
> On my other old laptop with 32bit kernel next and graphics card Intel 945GM
> just after the revert commit working OK,
> before, after login to gnome shell in some seconds decorations disappear
> 32 bit Ubuntu 12.04.5 LTS, gnome shell, kernel source next 14-10-2014
> Can anyone confirm this ?

Sorry, believe it or not, for me it is hard to find a 32bit machine even VM. :)

Could the attached patch by any chance help? I noticed cookie_v4_check()
still uses IPCB() instead of TCPCB() at TCP layer.


View attachment "tcp-cb.diff" of type "text/plain" (3524 bytes)

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