Re: [PATCH] net: filter: Convert the BPF VM to threaded code

On Tue, 09 Aug 2011 10:36:28 +0200, Eric Dumazet wrote:



 

I am speaking of one single conditional branch, the one that is done for

every BPF instruction done in a filter. It's never taken, so must be

predicted by the cpu. A perf session could make sure it is  ;)

Ahh, ok - perf is your friend, I know Eric ;-)

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+		switch ((enum bpf_inst)fentry->code) {

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That should not differ! Eric, sure that this do the trick?

It is the way to tell gcc to make its optimizations, if they exists on

enum switch (), as David suggested.

Argl, I see sock_filter.code is declared as __u16 not enum.





Hagen