linux-kernel - Re: skb_release_head_state(): Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-ID: <4921DC61.4000702@cosmosbay.com>
Date:	Mon, 17 Nov 2008 22:04:33 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	cl@...ux-foundation.org, efault@....de, a.p.zijlstra@...llo.nl,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: skb_release_head_state(): Re: [Bug #11308] tbench regression
 on	each kernel release from 2.6.22 -&gt; 2.6.28

Ingo Molnar a écrit :
> (gdb) list *0xffffffff8048942e
> 0xffffffff8048942e is in skb_release_head_state (include/linux/skbuff.h:1783).
> 1778	}
> 1779	#endif
> 1780	#ifdef CONFIG_BRIDGE_NETFILTER
> 1781	static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge)
> 1782	{
> 1783		if (nf_bridge && atomic_dec_and_test(&nf_bridge->use))
> 1784			kfree(nf_bridge);
> 1785	}
> 1786	static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge)
> 1787	{
> 
> and ouch does that global dec on &nf_bridge->use hurt!
> 
> i do have:
> 
>   CONFIG_BRIDGE_NETFILTER=y
> 
> (this is a Fedora distro kernel derived .config)

Hum, you also should hit this cache line at atomic_inc() site then...

Strange, I never caught this one.

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