From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [RFC PATCH v2] bridge: make it possible for packets to traverse the bridge without hitting netfilter Date: Fri, 09 Mar 2018 16:15:14 +0000 Message-ID: <1520612114.29061.15.camel@infradead.org> References: <20150306142932.GA15926@salvia> <20150306163700.GC20382@breakpoint.cc> <1520609475.17937.42.camel@infradead.org> <20180309.105724.519703919967625754.davem@davemloft.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-8O4ayv2Vew/IvYeGoCpA" 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 To: David Miller Return-path: In-Reply-To: <20180309.105724.519703919967625754.davem@davemloft.net> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.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? I confess I don't even know how realistic that is. --=-8O4ayv2Vew/IvYeGoCpA Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 3PZ0chY1PaVWjg59d4Uno+5LRDbgCnPkKJX4ysBGadibjBGQGJEZCjh94iiEebn2KsRLvtrJ72Ph 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