From owner-freebsd-net@FreeBSD.ORG Fri Nov 23 15:52:58 2012 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id B89A7431 for ; Fri, 23 Nov 2012 15:52:58 +0000 (UTC) (envelope-from barney_cordoba@yahoo.com) Received: from nm20.bullet.mail.ne1.yahoo.com (nm20.bullet.mail.ne1.yahoo.com [98.138.90.83]) by mx1.freebsd.org (Postfix) with ESMTP id 722E28FC15 for ; Fri, 23 Nov 2012 15:52:58 +0000 (UTC) Received: from [98.138.226.179] by nm20.bullet.mail.ne1.yahoo.com with NNFMP; 23 Nov 2012 15:52:52 -0000 Received: from [98.138.89.166] by tm14.bullet.mail.ne1.yahoo.com with NNFMP; 23 Nov 2012 15:52:52 -0000 Received: from [127.0.0.1] by omp1022.mail.ne1.yahoo.com with NNFMP; 23 Nov 2012 15:52:52 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 548290.49123.bm@omp1022.mail.ne1.yahoo.com Received: (qmail 92097 invoked by uid 60001); 23 Nov 2012 15:52:52 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1353685972; bh=qwORA9kHLQJl/TZUcdLgPs7pmVb9O2S83kSAGT7tcS4=; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:Message-ID:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type; b=sZZW/UnkV9U6e10aMXEOU+lexVbS8xf08eG6oOAurSV6/KmqyHIgEgmIK1tshw2Dyl3tDnDVqVILn18IR+RHbJOLQs/FCQ2qd6DSNt42SaV9P1SF6iL7JVv1p3FjF3qb/D0oI5O9c3G3W3VMBG28kxHGqtYNkpsxnChlpbpwzBY= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:Message-ID:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type; b=vyys9Gx4NZYnKxpmetrrItVXNpjv6ixY/WqFXQi+vEF17jl5b9SeNp5aC5Zwlp5n4nfZoO55hiV80PN4zffbCvyYvxRxXBW6E2Ey24Tvht6u/M3X1NFLn2/g4b3qJha+Sprql10MpnRubOHL2/vwHQr/y83X5NwN8Ky3vQacbB4=; X-YMail-OSG: Yeg19q8VM1l49LVs.AtVe2G96HwAKRr_W4XOh1AfvjAQlI2 7xugjAxa3qlAwIe4yfPB0skPoZAA2xyKuwM1aUlS06Hb6gQV3_OTMoL2tM63 G3aWUdi1Ma21.ju420OnkhIimwefmUYuXlJO3VqzLuroeGDh9Kq9mZCEzcc4 NNXoHfOhfQcDoYaG7aDGjpnzmwzuzwA2IbhqbZ3.DLURzVqBZGTwArmDn3yu lKcK9pNRC1vw_f7N47_tQw5sS0U9efpGFuXEvWDJrNbog6TCyfqA33bhIF8Q iDbNZ.U51YZvwrfMPh4akfvPfEslBzG01Gbl01MCoRXTN5PPmTaIfcFDqxVQ w69ABHWTVg8P4eV26SYP2WWxLUa8flFQjomMclGgMo5gqO_iN7IUK6KDkxl8 dji4IEoE9oCxUuzP7qwTKkzMvifOKOEsILmMMAd8pLN7m94tlNr9SuyaBq_z axJYZcpohYPhDTJZaS2.8AoPgwuuAygS1d4AzMJBWht4HKlVtiXlA1xLvj7Y c.x5s__ZgNo23_j0jBw-- Received: from [174.48.128.27] by web121601.mail.ne1.yahoo.com via HTTP; Fri, 23 Nov 2012 07:52:51 PST X-Rocket-MIMEInfo: 001.001, CgotLS0gT24gRnJpLCAxMS8yMy8xMiwgQW5kcmUgT3BwZXJtYW5uIDxhbmRyZUBmcmVlYnNkLm9yZz4gd3JvdGU6Cgo.IEZyb206IEFuZHJlIE9wcGVybWFubiA8YW5kcmVAZnJlZWJzZC5vcmc.Cj4gU3ViamVjdDogUmU6IExvdyBCYW5kd2lkdGggb24gaW50ZXJjb250aW5lbnRhbCBjb25uZWN0aW9ucwo.IFRvOiAiSW5nbyBGbGFzY2hiZXJnZXIiIDxpZkB4aXAuYXQ.Cj4gQ2M6IGZyZWVic2QtbmV0QGZyZWVic2Qub3JnCj4gRGF0ZTogRnJpZGF5LCBOb3ZlbWJlciAyMywgMjAxMiwgMTA6MDUgQU0KPiBPbiABMAEBAQE- X-Mailer: YahooMailClassic/15.0.8 YahooMailWebService/0.8.123.460 Message-ID: <1353685971.91981.YahooMailClassic@web121601.mail.ne1.yahoo.com> Date: Fri, 23 Nov 2012 07:52:51 -0800 (PST) From: Barney Cordoba Subject: Re: Low Bandwidth on intercontinental connections To: Ingo Flaschberger , Andre Oppermann In-Reply-To: <50AF90D1.4020404@freebsd.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: freebsd-net@freebsd.org X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Nov 2012 15:52:58 -0000 --- On Fri, 11/23/12, Andre Oppermann wrote: > From: Andre Oppermann > Subject: Re: Low Bandwidth on intercontinental connections > To: "Ingo Flaschberger" > Cc: freebsd-net@freebsd.org > Date: Friday, November 23, 2012, 10:05 AM > On 23.11.2012 15:46, Ingo > Flaschberger wrote: > > Am 23.11.2012 13:47, schrieb Marc Peters: > >> PR filed: http://www.freebsd.org/cgi/query-pr.cgi?pr=173859 > > > > Downloads from ftp1.us.freebsd.org to Europe (ping time > ~170ms), I see up & down ramping of transfer > > speed (600kb/sec - 50kb/sec) > > over serverall releases: > > FreeBSD 6.3-PRERELEASE > > FreeBSD 7.2-STABLE > > FreeBSD 8.2-STABLE > > FreeBSD 9.1-PRERELEASE > > > > Linux performs much better, max speed was 1.2Mb/sec, > and is not as much up & down ramping as freebsd. > > It's about 168ms for me and I don't see the problem here. > Speed is about 18.4Mbps. > > -- > Andre It's probably something with the window timeout. On a local connection, the acks come in before the window is fully sent (or very nearly) while on a distant connection the window is sent and then there is a longish delay/wait. This used to be a big issue on ftp servers back in the day. The algorithms for how to send stuff when the window left was less than a full packet were poorly done. BC