per-cpu table information

Harald Welte laforge at
Thu Sep 16 00:36:02 CEST 2004

On Thu, Sep 09, 2004 at 03:47:02PM +0530, Swapnil Nagle wrote:
> Hi all,
> Why is the table information (ipt_table_info to be specific) duplicated 
> for each CPU in ipt_table?

Because we don't need any locking and we don't have cache line ping-pong
between the CPU's, if there is no shared data.

> Regards,
> Swapnil.

- Harald Welte <laforge at>   
  "Fragmentation is like classful addressing -- an interesting early
   architectural error that shows how much experimentation was going
   on while IP was being designed."                    -- Paul Vixie
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