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From: "Laura García Liébana" <nevola@gmail.com>
To: John Fastabend <john.fastabend@gmail.com>
Cc: Lukas Wunner <lukas@wunner.de>,
	Pablo Neira Ayuso <pablo@netfilter.org>,
	Jozsef Kadlecsik <kadlec@netfilter.org>,
	Florian Westphal <fw@strlen.de>,
	Netfilter Development Mailing list 
	<netfilter-devel@vger.kernel.org>,
	coreteam@netfilter.org, netdev@vger.kernel.org,
	Daniel Borkmann <daniel@iogearbox.net>,
	Alexei Starovoitov <ast@kernel.org>,
	Eric Dumazet <edumazet@google.com>, Thomas Graf <tgraf@suug.ch>,
	David Miller <davem@davemloft.net>
Subject: Re: [PATCH nf-next v3 3/3] netfilter: Introduce egress hook
Date: Fri, 4 Sep 2020 10:54:58 +0200	[thread overview]
Message-ID: <CAF90-WgMiJkFsZaGBJQVVrmQz9==cq22NErpcWuE7z-Q+A8PzQ@mail.gmail.com> (raw)
In-Reply-To: <5f5078705304_9154c2084c@john-XPS-13-9370.notmuch>

Hi,

On Thu, Sep 3, 2020 at 7:00 AM John Fastabend <john.fastabend@gmail.com> wrote:
>
[...]
>
> I don't think it actualy improves performance at least I didn't observe
> that. From the code its not clear why this would be the case either. As
> a nit I would prefer that line removed from the commit message.
>

It hasn't been proven to be untrue either.


[...]
>
> Do you have plans to address the performance degradation? Otherwise
> if I was building some new components its unclear why we would
> choose the slower option over the tc hook. The two suggested
> use cases security policy and DSR sound like new features, any
> reason to not just use existing infrastructure?
>

Unfortunately, tc is not an option as it is required to interact with
nft objects (sets, maps, chains, etc), more complex than just a drop.
Also, when building new features we try to maintain the application
stack as simple as possible, not trying to do ugly integrations.

I understand that you measure performance with a drop, but using this
hook we reduce the datapath consistently for these use cases and
hence, improving traffic performance.

Thank you for your time!

  reply	other threads:[~2020-09-04  8:55 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-27  8:55 [PATCH nf-next v3 0/3] Netfilter egress hook Lukas Wunner
2020-08-27  8:55 ` [PATCH nf-next v3 1/3] netfilter: Rename ingress hook include file Lukas Wunner
2020-08-27  8:55 ` [PATCH nf-next v3 2/3] netfilter: Generalize ingress hook Lukas Wunner
2020-08-27  8:55 ` [PATCH nf-next v3 3/3] netfilter: Introduce egress hook Lukas Wunner
2020-08-28 18:52   ` John Fastabend
2020-09-03  5:00     ` John Fastabend
2020-09-04  8:54       ` Laura García Liébana [this message]
2020-09-04 15:46         ` John Fastabend
2020-09-05 11:13           ` Laura García Liébana
2020-09-04 16:21       ` Lukas Wunner
2020-09-04 21:14         ` Daniel Borkmann
2020-09-05  5:24           ` Lukas Wunner
2020-09-08 12:55             ` Daniel Borkmann
2020-09-11  7:42               ` Laura García Liébana
2020-09-11 16:27                 ` Daniel Borkmann
2020-09-14 11:29                   ` Laura García Liébana
2020-09-14 22:02                     ` Daniel Borkmann
2020-09-17 10:28                       ` Laura García Liébana
2020-09-18 20:31                         ` Daniel Borkmann
2020-09-19 15:52                           ` Pablo Neira Ayuso
2020-09-21  7:07                           ` Laura García Liébana
2020-10-11  8:26                       ` Lukas Wunner
2020-11-21 18:59                         ` Pablo Neira Ayuso
2020-11-22  3:24                           ` Alexei Starovoitov
2020-11-22 11:01                             ` Pablo Neira Ayuso
2020-11-24  3:34                               ` Alexei Starovoitov
2020-11-24  7:31                                 ` Lukas Wunner
2020-11-24 22:55                                   ` Alexei Starovoitov
2020-10-11  7:59               ` Lukas Wunner
2020-09-05 11:18           ` Laura García Liébana
2020-09-07 22:11             ` Daniel Borkmann
2020-09-08  6:19               ` Laura García Liébana
2020-09-08 11:46           ` Arturo Borrero Gonzalez
2020-09-08 13:27             ` Daniel Borkmann
2020-09-08 18:58         ` John Fastabend
2020-09-19 15:54   ` Pablo Neira Ayuso
2020-09-28 12:20     ` Lukas Wunner
2020-08-27 10:36 ` [PATCH nf-next v3 0/3] Netfilter " Laura García Liébana
2020-08-28  7:14 ` Daniel Borkmann
2020-08-28  9:14   ` Eric Dumazet

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