From owner-freebsd-net Mon Jul 16 8:45:21 2001 Delivered-To: freebsd-net@freebsd.org Received: from zogbe.tasam.com (cj45658-a.reston1.va.home.com [65.9.36.73]) by hub.freebsd.org (Postfix) with ESMTP id B87AA37B406 for ; Mon, 16 Jul 2001 08:45:07 -0700 (PDT) (envelope-from clash@tasam.com) Received: from battleship (zogbe.tasam.com [10.45.45.5] (may be forged)) by zogbe.tasam.com (8.11.4/8.11.4) with SMTP id f6GFj2h26014; Mon, 16 Jul 2001 11:45:02 -0400 (EDT) Message-ID: <00d201c10e0e$4720fdc0$0b2d2d0a@battleship> From: "Joseph Gleason" To: "Peter Pentchev" , References: <20010716152638.B52566@ringworld.oblivion.bg> Subject: Re: ICMP source quench - deprecated? Date: Mon, 16 Jul 2001 11:45:02 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.3018.1300 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.3018.1300 Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Unless I am mistaken, ICMP source quench applies to any IP traffic, not just TCP. Also, ICMP source quench can be sent by intermediate routers. ----- Original Message ----- From: "Peter Pentchev" To: Sent: Monday, July 16, 2001 08:26 Subject: ICMP source quench - deprecated? > Hi, > > I just had a friend ask me a weird question about ICMP source quench > and its handling in various OS's. He proceeded to show me a part > of some version of the Linux kernel source, which processed a source > quench request properly, yet had a 'This is deprecated' comment > at the top. > > I had a quick look at src/sys/netinet/tcp_subr.c, and on FreeBSD 4.x > and -current, an ICMP source quench seems to provoke a proper downsizing > of the connection window. > > Is there any reason for ICMP source quench to be deprecated? > If so, what is it to be replaced with? Or are the TCP window scaling > algorithms smart enough to downsize the window quick enough in case of > a noticeable packet loss? (I guess they should be..) > > G'luck, > Peter > > -- > If I were you, who would be reading this sentence? > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message