Date: Fri, 23 Nov 2012 07:52:51 -0800 (PST) From: Barney Cordoba <barney_cordoba@yahoo.com> To: Ingo Flaschberger <if@xip.at>, Andre Oppermann <andre@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: Low Bandwidth on intercontinental connections Message-ID: <1353685971.91981.YahooMailClassic@web121601.mail.ne1.yahoo.com> In-Reply-To: <50AF90D1.4020404@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--- On Fri, 11/23/12, Andre Oppermann <andre@freebsd.org> wrote: > From: Andre Oppermann <andre@freebsd.org> > Subject: Re: Low Bandwidth on intercontinental connections > To: "Ingo Flaschberger" <if@xip.at> > 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1353685971.91981.YahooMailClassic>