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[209.132.180.67]) by mx.google.com with ESMTP id bg2-v6si1091973plb.30.2018.03.09.08.16.39; Fri, 09 Mar 2018 08:16:54 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=twosheds.20170209 header.b=lMSJI6od; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932162AbeCIQPZ (ORCPT + 99 others); Fri, 9 Mar 2018 11:15:25 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:40348 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751170AbeCIQPY (ORCPT ); Fri, 9 Mar 2018 11:15:24 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=gtECRCWomaP7Q0P5erZoE0le17OY3L7AgtW9hO+HQMw=; b=lMSJI6odf+RZwk2dYPCZYEdRi q924CWDBtht6DcGlOZpJMHzkvmS1dICDmSHVbzVWeFDUG5kCL8wQsHqxyMHx3PcitV/LacBlkU1km szuhnMkLt2tCjgrJ1WBHNzuNuzbsqrZYIz3YK72bdQVW7FRBUnRYcJsMQVU0lLlphRTrt5jAqDmTL bJgwS+m6I5wK4NsbFrS+XvtWYTOvbt/g0sHFZYvlgDgByGmcDnWsbDReRNENQQsYmWptCu3v3sM+q OtpZVLD0+XFQqjXzaqzQFLgpXTBG6tUjZKncUb1MkXe/4XvjMXEi7XFTKBO+rMkuHsmOJ6G32nzDR rd7mAAinw==; Received: from [2001:8b0:10b:1::b8f] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1euKfr-0005as-2T; Fri, 09 Mar 2018 16:15:15 +0000 Message-ID: <1520612114.29061.15.camel@infradead.org> Subject: Re: [RFC PATCH v2] bridge: make it possible for packets to traverse the bridge without hitting netfilter From: David Woodhouse To: David Miller Cc: fw@strlen.de, pablo@netfilter.org, rga@amazon.de, bridge@lists.linux-foundation.org, stephen@networkplumber.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, aliguori@amazon.com, nbd@openwrt.org In-Reply-To: <20180309.105724.519703919967625754.davem@davemloft.net> References: <20150306142932.GA15926@salvia> <20150306163700.GC20382@breakpoint.cc> <1520609475.17937.42.camel@infradead.org> <20180309.105724.519703919967625754.davem@davemloft.net> Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAG1BMVEUHBwcUFBQpKSlGRkZhYWF9fX2Xl5eysrLMzMxFF+rXAAACaElEQVQ4y21UQXbbIBQE9wJALmAg6ToWON22FrhZthHgbvssUPathC7QWMful2JHSmtWwGg+zPxBCE0DU4QoJQgRgsg4w2gJjBNE8PjFBZgnQMBs+uZ1NQNQjZO3BV4AGDFC0f+l4DBG0VUAM4yv7SO8IgRdHXQ+A78HKL5OAeCfNQV5cHX8DsBUyIJKtYbt98BKaGNCKjfgFVkqYVLbkHKsRsbSCSa0T6npIqLrpRBgQKHUpQmgs9eEKaiUcooE8WWfCGVnBiUcn1uF2XhbfmN9apKnmMP2K4kizKkQWxuaVNOpU2cACIyxO1Po8ETHcXEDMVnozcejkAYA9iaD4pU0ZvNQ8VurNnTuFAYVtuIPUZW25PjDIjQAlGyffIiRQxoWAZBmJ0LTdW2Nyc0iP3DqRhxizvGJkBWZmyFVyZkddWzmBoIBVMpCCJ1CFzl98xav4VJKSSD45KbUT75ixikTphDSRh8+Uz7JLgUTAgAFwzqzjxc/nDY7WUApqY0OMdTwCKZSXplSKkgIRCHElCp8ZnhnKqXuwcNbk1L0VXE+I9alUXoHlLHl3mv7/dWQlJwtjREC7mu9L/U2jQyMUuO2EDS4q9Kl2ddm232bxIE5pjJuVwiljNn/Cfv25/T0cu5cZbwHGVq7h/zp0B4n3S99V/utD+Uo8BiGx9xCsOAV5z7/tjo4Z4z1Lvb90KZ7eFOoOeXOukqF2seo234YYuaQPpRP+cVZU5adT1Edun5Iz3z8fTz3+eSDh0Ip1c7zx1MaijGzTd/3MbRuBHz8cvcVgCMBRpOHvgu59WDhoat+nIZm+LWm9C/aaaGq5DCP9QAAAABJRU5ErkJggg== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-8O4ayv2Vew/IvYeGoCpA" Date: Fri, 09 Mar 2018 16:15:14 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-8O4ayv2Vew/IvYeGoCpA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-03-09 at 10:57 -0500, David Miller wrote: > From: David Woodhouse > Date: Fri, 09 Mar 2018 15:31:15 +0000 >=20 > > Eschewing a 15% speedup on the basis that "well, even though we've had > > three of these already for a decade, we're worried that adding a fourth > > might open the floodgates to further patches" does seem a little odd to > > me, FWIW. >=20 > The cost we are dealing with is a fundamental one which is a result of > the hook design. >=20 > Indirect calls are killer. >=20 > Indirect calls are even more killer now in the age of Spectre and > retpolines. Imre's 15% measurement was, obviously, before that. We should redo it and confirm the numbers. > I definitely would rather see the fundamental issue addressed rather > than poking at it randomly with knobs for this case and that. Yeah. What do you think of the suggestion I made =E2=80=94 that a given hoo= k should automatically disable itself if it tautologically does nothing? Coupled with notifiers for when the rules change, to re-enable the hooks again? 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