Re: Table duplication on smp machine

[Thomas Heinz <creatix@hipac.org>]

Hi Harald

You wrote:
> then you start having cacheline ping-pong problems when match/target
> private data is written to (like in the limit match, ...)

Hm, I don't understand. The limit match performs the write operations
on the same private data block for all cpu's so the cacheline ping-pong
occurs in the current scheme too [in addition to the locking overhead].

Of course this would be true if a match/target uses its per-cpu
data block to store information but I cannot imagine a scenario
where this makes sense or whatsoever.

> apart from that, ther is no reason why we shouldn't do what you are
> proposing.  In fact, this is exactly what my initial pkttables/iptables2
> design does ;)

Ok :)


Thomas