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

[Eric Dumazet]

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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