From: Hagen Paul Pfeifer <hagen@jauu.net>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>, <rui314@gmail.com>,
<netdev@vger.kernel.org>
Subject: Re: [PATCH] net: filter: Convert the BPF VM to threaded code
Date: Tue, 09 Aug 2011 10:53:22 +0200 [thread overview]
Message-ID: <4039f2893f574313ee14131c7f9961d3@localhost> (raw)
In-Reply-To: <1312878988.2371.9.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
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 ;-)
>> > + switch ((enum bpf_inst)fentry->code) {
>>
>> 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
prev parent reply other threads:[~2011-08-09 8:53 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-29 8:10 [PATCH] net: filter: Convert the BPF VM to threaded code Rui Ueyama
2011-07-29 9:30 ` Eric Dumazet
2011-07-30 5:09 ` Rui Ueyama
2011-07-30 6:04 ` Eric Dumazet
2011-07-30 6:20 ` Eric Dumazet
2011-07-30 9:55 ` Francois Romieu
2011-08-01 18:16 ` Hagen Paul Pfeifer
2011-08-01 18:37 ` Eric Dumazet
2011-08-02 0:57 ` David Miller
2011-08-09 5:00 ` Eric Dumazet
2011-08-09 8:29 ` Hagen Paul Pfeifer
2011-08-09 8:36 ` Eric Dumazet
2011-08-09 8:53 ` Hagen Paul Pfeifer [this message]
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