From owner-freebsd-transport@freebsd.org Tue Mar 6 15:11:56 2018 Return-Path: Delivered-To: freebsd-transport@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5376BF395C5 for ; Tue, 6 Mar 2018 15:11:56 +0000 (UTC) (envelope-from jonlooney@gmail.com) Received: from mail-wm0-x22e.google.com (mail-wm0-x22e.google.com [IPv6:2a00:1450:400c:c09::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id AD11C7AF90 for ; Tue, 6 Mar 2018 15:11:55 +0000 (UTC) (envelope-from jonlooney@gmail.com) Received: by mail-wm0-x22e.google.com with SMTP id s206so18452441wme.0 for ; Tue, 06 Mar 2018 07:11:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=y46UXZ2BaRNrfNrckBsh8sD5bVb/FJ69M3OEdq+HTAE=; b=HOcn6bHuhdrK/DWsIiW7wIMXE1Niv+asIaQGpCPO+ZXInNBJ+oul6ezMWOIk50DISP 18JvYGf8MjLjt9TTt1b3+xyUuf/KEtbZyIpz3yajN3a2KjQkOCXTat6fEMfi+Gtae7/P Obte96Uum7gvN2kQn0glZY4aj6B+7+S7sf3QMLt7z3jbG12RDxKS/qMmzopKiwiu+yXd fZGykWfDpCcB6+pY1kKMSGw4S8loaUIN2XUFW+jR5etJPCIEmGc3ouvqfK6wXtb1yeGe 8AT4cyhHDpV7lEr3+RJGiTjChBeUMFymyFDFIqeTv/5woUGG+21YQlvhbTZOceUoqgk/ 3g8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=y46UXZ2BaRNrfNrckBsh8sD5bVb/FJ69M3OEdq+HTAE=; b=H5ZEP/ajyJnIRqvi2sBc6qTuhimgY5HXKGSU08C9bwC4SxPDmZu7oPOmFmLBATiQcs +usEIW5fVtgNEbWYzIhEAIXRgSR3zIU/bT+wFLHyVrv1wCA8A1UgmX4HTlogcvLdLlaZ Zbu5VRJprmYgPz3bVETvxbZHgUUMq7wXwd+SYYS0p5GK3qoKyMVdOrZ0qNomybiI1qYI QrwXYrs0+EYHhPG1kcFC39Xei5OrbPr43xASyVFG3bwazcubLSBTNHuGcDn4CZNx1Z5a brwOCFacj987ocAIqHYscAemcokFoi0saFUNfUK/7EfEbboyuwUG5w59H2El9VW/g4Jn CYmg== X-Gm-Message-State: AElRT7E7ilw0X+vmo01KSWrr5mOGFFUqEJF/jZuTTXmfnZubS3/p/2cd e9LqSGcy+dYLWYc8zuWFCPTqbCiBol/NQB3FJaGTKQ== X-Google-Smtp-Source: AG47ELu7dbF39d2b73bD00xWfL/MEqk0QRqEftn6Ff2/A3ljx4jZqFgQcZcU6Ge9vZ2A5gRSiJLB2nSl8T59tTNHkpI= X-Received: by 10.28.15.10 with SMTP id 10mr11604428wmp.75.1520349114335; Tue, 06 Mar 2018 07:11:54 -0800 (PST) MIME-Version: 1.0 Received: by 10.223.192.2 with HTTP; Tue, 6 Mar 2018 07:11:53 -0800 (PST) From: Jonathan Looney Date: Tue, 6 Mar 2018 10:11:53 -0500 Message-ID: Subject: Pre-IETF Gathering in Cambridge To: "" X-Mailman-Approved-At: Tue, 06 Mar 2018 17:08:38 +0000 Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Mar 2018 15:11:56 -0000 Folks, I know this is last minute; however, I wanted to distribute this anyway... Because several people will be in London for IETF, there is a group planning to get together in Cambridge on March 16 and 17 to work on FreeBSD transport-related things. This is not a formal dev summit; rather, it is just a bunch of people getting together to discuss things and maybe (hopefully!) commit some code. If you are able and interested, send me a unicast and I'll send you back more details. Jonathan From owner-freebsd-transport@freebsd.org Wed Mar 7 15:46:38 2018 Return-Path: Delivered-To: freebsd-transport@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1E8D7F38E24; Wed, 7 Mar 2018 15:46:38 +0000 (UTC) (envelope-from Cheng.Cui@netapp.com) Received: from mx143.netapp.com (mx143.netapp.com [IPv6:2620:10a:4005:8000:2306::c]) (using TLSv1.2 with cipher RC4-SHA (128/128 bits)) (Client CN "mx141.netapp.com", Issuer "Entrust Certification Authority - L1K" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 333027BF42; Wed, 7 Mar 2018 15:46:37 +0000 (UTC) (envelope-from Cheng.Cui@netapp.com) X-IronPort-AV: E=Sophos;i="5.47,436,1515484800"; d="scan'208,217";a="246794721" Received: from vmwexchts01-prd.hq.netapp.com ([10.122.105.12]) by mx143-out.netapp.com with ESMTP; 07 Mar 2018 07:35:15 -0800 Received: from VMWEXCCAS01-PRD.hq.netapp.com (10.122.105.11) by VMWEXCHTS01-PRD.hq.netapp.com (10.122.105.12) with Microsoft SMTP Server (TLS) id 15.0.1320.4; 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Wed, 7 Mar 2018 15:35:11 +0000 From: "Cui, Cheng" To: "freebsd-transport@freebsd.org" CC: "freebsd-net@freebsd.org" Subject: why not enable tcp_pmtud_blackhole_detect in default Thread-Topic: why not enable tcp_pmtud_blackhole_detect in default Thread-Index: AQHTtinhP/rzBtCpJk+ShXm25E/EPQ== Date: Wed, 7 Mar 2018 15:35:11 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=Cheng.Cui@netapp.com; x-originating-ip: [216.240.30.25] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; CY4PR06MB3143; 7:AIKy7KSclJn3kNFPsld8ADfSIkMyKXwFmYGAUJqehP+xM+u5sVo8bhl3XBnYBwTA6H/lF9npWEwEn6uL/+SmYRMaQ63pr5ggNHzOnJgJV5RhzHEVVIqY0HNIk7jfHwbq+ISibhbHvAaZ9YwjqSfJgOYLJwbFJDcE/OFg7Yw1QTDIcWnbN04qRCWYB0NU62ZbbpmPUz5qzCUuCHCL2Zo9+E2XWZA/LT718Rv3nG945ureS4oWVDLQFC5jbdPVWRIj x-ms-exchange-antispam-srfa-diagnostics: SSOS; x-ms-office365-filtering-correlation-id: 8552a378-ecf3-4f6d-cc54-08d584410402 x-microsoft-antispam: UriScan:; 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charset="utf-8" Content-Transfer-Encoding: base64 X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Mar 2018 15:46:38 -0000 RGVhciBhbGwsDQoNClJlYWRpbmcgdGhyb3VnaCB0aGUgdGNwIGJsYWNraG9sZSBkZXRlY3Rpb24g Y29kZSAoc3VwcG9ydCBSRkMgNDgyMSkgaW4gRnJlZUJTRCBpbmNsdWRpbmcgdGhlIHJlY2VudCBi dWcgZml4ZXMsIEkgYW0gd29uZGVyaW5nIHdoeSBpcyBpdCBzdGlsbCBub3QgZW5hYmxlZCBpbiBk ZWZhdWx0PyBHaXZlbiB0aGUgZmFjdCB0aGF0IHRoaXMgaW1wbGVtZW50YXRpb24gd2FzIGEgbWVy Z2UgZnJvbSB4bnUsIGFuZCB0aGUgeG51IGhhcyBlbmFibGVkIGl0IGluIGRlZmF1bHQsIGRvIHdl IGhhdmUgYSBwbGFuIHRvIGVuYWJsZSBpdCBpbiBkZWZhdWx0PyBPciBpcyB0aGVyZSBhbnkgY29u Y2VybiBhYm91dCB0aGUgc2lkZS1lZmZlY3QgZnJvbSBpdCBhcyBwZXJmb3JtYW5jZSByZWdyZXNz aW9uIGFnYWluc3Qgc29tZSBmYWxzZSBwb3NpdGl2ZSBibGFja2hvbGUgZXZlbnQgbGlrZSBhIHRl bXBvcmFyeSBsaW5rIGZsYXAsIHdoaWNoIGlzIGxvbmcgZW5vdWdoIHRvIHRyaWdnZXIgYSBsb3dl ciBNU1MgYnV0IHNob3J0ZXIgdGhhbiA2IFJUTz8NCg0KaHR0cHM6Ly9vcGVuc291cmNlLmFwcGxl LmNvbS9zb3VyY2UveG51L3hudS0xNDU2LjEuMjYvYnNkL25ldGluZXQvdGNwX3RpbWVyLmMuYXV0 by5odG1sICA8PCBlbmFibGVkIGluIG1hY09TIDEwLjYNCmh0dHBzOi8vcmV2aWV3cy5mcmVlYnNk Lm9yZy9yUzMyMjk2NyAgPDwgYnVnIGZpeGVzDQpodHRwczovL3Jldmlld3MuZnJlZWJzZC5vcmcv clMyNzI3MjAgIDw8IG1lcmdlIGZyb20geG51DQoNClRoYW5rcywNCi0tQ2hlbmcgQ3VpDQpOZXRB cHAgU2NhbGUgT3V0IE5ldHdvcmtpbmcNCmh0dHBzOi8vbmV0YXBwLW1lZXRpbmcud2ViZXguY29t L21lZXQvY2hlbmdjDQoNCg0K From owner-freebsd-transport@freebsd.org Wed Mar 7 20:33:58 2018 Return-Path: Delivered-To: freebsd-transport@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id CEA17F2DE44 for ; Wed, 7 Mar 2018 20:33:58 +0000 (UTC) (envelope-from kevin.bowling@kev009.com) Received: from mail-it0-x230.google.com (mail-it0-x230.google.com [IPv6:2607:f8b0:4001:c0b::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 1A0526CA92 for ; Wed, 7 Mar 2018 20:33:57 +0000 (UTC) (envelope-from kevin.bowling@kev009.com) Received: by mail-it0-x230.google.com with SMTP id j7so5072200ita.3 for ; Wed, 07 Mar 2018 12:33:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kev009.com; s=google; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=tHTZgNc1ofQDcImm2Vf8mE8hJzGHHIprG9RoOGs/SNI=; b=Fyr8J/JGSFOTQ8zQdJ8UvjlixJNkjRraaSmU7IC98t414UHqndq2Zriipsmxn7oFzR abVaFJGdjkH44jlnyESE5YF9QqLSOljBHqxIxo4wSkcO698cEY+mAVRCJgNgXDHhaW8x l5vYd69/fTqRr4/hD0ot3c9Ob3o7KNy3ao6SM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=tHTZgNc1ofQDcImm2Vf8mE8hJzGHHIprG9RoOGs/SNI=; b=dpehTvSIiJpYPKwzB/QtN/qlg4P7XIIoEEoEAALAQ04r7AiTHvSDJ6I1ryyjXHQGQB mDiOzku2NBsfmaQxgPW3Q35yzgtt/En8cH29EWu4KGy4aNaDGygEXjqvE8dPiFxMqoJW J5r4H0hdJIMa1+H7WojFSX0XspMCU/zvzZfV4SHTb9YhfVPx2i+O71wMWN1IBuD8GoUA tiuLauLsa/BVtyVz9+z+72o4xUgbxsO2g5jPFZhsPnzOZ0MU1RPzzVKnpG+4x/DUTyB3 RPgi0EG6L9LLHixg9N7Mt7642/e35GEUuceUTDZBd9m/7gK5fJvMCP3GyESxpNvZuT76 iMqQ== X-Gm-Message-State: AElRT7G4ZCPrW4D0nxhAoyA/OUovFIouDhgmEU9MYlQ3cTyfDcXTAa3d KqMK05WirstQywDiLHlA6no8/wdwMvypCcneVXTWEQ== X-Google-Smtp-Source: AG47ELu+oaRBJeQETM3n45BF5wxcCJxCeRkz7Yd40H34Vo8PYp3CCP03OKS3PXr9I78lWuTSp9yQFcYorHtwJ/rBkMI= X-Received: by 10.36.250.70 with SMTP id v67mr23334450ith.99.1520454837210; Wed, 07 Mar 2018 12:33:57 -0800 (PST) MIME-Version: 1.0 Received: by 10.2.181.72 with HTTP; Wed, 7 Mar 2018 12:33:56 -0800 (PST) In-Reply-To: References: From: Kevin Bowling Date: Wed, 7 Mar 2018 13:33:56 -0700 Message-ID: Subject: Re: why not enable tcp_pmtud_blackhole_detect in default To: "Cui, Cheng" Cc: "freebsd-transport@freebsd.org" , "freebsd-net@freebsd.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailman-Approved-At: Wed, 07 Mar 2018 22:10:00 +0000 X-BeenThere: freebsd-transport@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Discussions of transport level network protocols in FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Mar 2018 20:33:59 -0000 Cheng, We run this in production at Limelight Networks (i.e toward a broad spectrum of Internet hosts) and must to deal with some uncommon network topology. There are currently some limitations as you point out. Like you say the signaling is not perfect and we do often clamp MSS unnecessarily. There is also no probing to see if we can expand the MSS later. I think those issues should be fixed up before it's enabled by default and I don't know anyone working on it at the moment. Regards, On Wed, Mar 7, 2018 at 8:35 AM, Cui, Cheng wrote: > Dear all, > > Reading through the tcp blackhole detection code (support RFC 4821) in Fr= eeBSD including the recent bug fixes, I am wondering why is it still not en= abled in default? Given the fact that this implementation was a merge from = xnu, and the xnu has enabled it in default, do we have a plan to enable it = in default? Or is there any concern about the side-effect from it as perfor= mance regression against some false positive blackhole event like a tempora= ry link flap, which is long enough to trigger a lower MSS but shorter than = 6 RTO? > > https://opensource.apple.com/source/xnu/xnu-1456.1.26/bsd/netinet/tcp_tim= er.c.auto.html << enabled in macOS 10.6 > https://reviews.freebsd.org/rS322967 << bug fixes > https://reviews.freebsd.org/rS272720 << merge from xnu > > Thanks, > --Cheng Cui > NetApp Scale Out Networking > https://netapp-meeting.webex.com/meet/chengc > > > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" From owner-freebsd-transport@freebsd.org Thu Mar 8 16:07:15 2018 Return-Path: Delivered-To: freebsd-transport@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 15ED0F3F2E5; 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