ftp.us.debian.org really slow/nonresponsive
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From: Merciadri Luca on 11 Jun 2010 14:00 Boyd Stephen Smith Jr. wrote: > On Friday 11 June 2010 11:52:42 Merciadri Luca wrote: > > > Closer geographically generally means fewer intermediate routers ("hops"). > Fewer hops generally means lower round-time times ("pings"). Lower pings > indirectly allows larger TCP/IP windows, and thus, higher maximum bandwidth. > > In addition, spreading the load among multiple servers means fewer users per > server, which increases the bandwidth available to each user. > > More bandwidth means less download time. > > The cdn service also removes out-of-date, heavily loaded, or "down" servers > from the results, meaning you are less likely to get old packages or download > failures. > That's on a theoretical point of view. Practically, there is quite no difference, at least most of the time. -- Merciadri Luca See http://www.student.montefiore.ulg.ac.be/~merciadri/ I use PGP. If there is an incompatibility problem with your mail client, please contact me. Live as if you were to die tomorrow; learn as if you were to live forever. (Mahatma Gandhi)
From: David Jardine on 11 Jun 2010 14:10 On Fri, Jun 11, 2010 at 12:20:22PM -0500, Boyd Stephen Smith Jr. wrote: > On Friday 11 June 2010 11:52:42 Merciadri Luca wrote: > > Boyd Stephen Smith Jr. wrote: > > > Details: http://wiki.debian.org/DebianGeoMirror > > > > What's the main interesting of using a server which is as near as > > possible from you, actually? > > Closer geographically generally means fewer intermediate routers ("hops"). > Fewer hops generally means lower round-time times ("pings"). Lower pings > indirectly allows larger TCP/IP windows, and thus, higher maximum bandwidth. > > In addition, spreading the load among multiple servers means fewer users per > server, which increases the bandwidth available to each user. > > More bandwidth means less download time. > > The cdn service also removes out-of-date, heavily loaded, or "down" servers > from the results, meaning you are less likely to get old packages or download > failures. And presumably makes a tiny contribution to the efficeint use of resources worldwide Cheers, David -- To UNSUBSCRIBE, email to debian-user-REQUEST(a)lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmaster(a)lists.debian.org Archive: http://lists.debian.org/20100611180844.GA3792(a)gennes.augarten
From: Joey Hess on 11 Jun 2010 15:00 Mark wrote: > I wonder the same, since the Debian installer even states the best mirror > choice may not be the one physically closest to you. It's not really accurate to say that cdn.debian.net chooses the mirror with the closest geographical location to you. It does something much more useful: It chooses a mirror that is known to be alive, and up-to-date, and is in the set of mirrors that are push primary mirrors -- the mirrors that are generally the best available in speed, connectivity, and maintenance. The last critera, after all those, is that the mirror be relatively near to you. It's possible, in some parts of some countries, for a connection to a mirror in the same country to need to travel under an ocean or over some other slow link, while a connection to a mirror in a different country travels over a fast link. AFAIK, cdn.debian.net does not have such network topology information available. Still, I think that the push-primary mirrors it selects generally work very well within their respective countries. New versions of the installer offer cdn.debian.net as an option. I'm looking forward to seeing how that works out, and maybe making the CDN the default later. Also looking forward to not needing to manually tweak my mirrors when I'm traveling. And already enjoying faster mirrors than I typically chose by hand, and especially, never being bothered when a mirror is down. -- see shy jo
From: Peter Schumann on 12 Jun 2010 15:10
Am 11.06.2010 12:02, schrieb Merciadri Luca: > Mark wrote: > >> On Thu, Jun 10, 2010 at 9:49 AM, Merciadri Luca >> <Luca.Merciadri(a)student.ulg.ac.be >> <mailto:Luca.Merciadri(a)student.ulg.ac.be>> wrote: >> >> [snip] >> >> >> $ ping ftp.us.debian.org <http://ftp.us.debian.org> >> PING ftp.us.debian.org <http://ftp.us.debian.org> (204.152.191.39) >> 56(84) bytes of data. >> ^C >> --- ftp.us.debian.org <http://ftp.us.debian.org> ping statistics --- >> 11 packets transmitted, 0 received, 100% packet loss, time 10023ms >> >> $ ping ftp.de.debian.org <http://ftp.de.debian.org> >> PING ftp.de.debian.org <http://ftp.de.debian.org> (141.76.2.4) >> 56(84) bytes of data. >> 64 bytes from ftp.de.debian.org <http://ftp.de.debian.org> >> (141.76.2.4): icmp_seq=1 ttl=44 time=51.2 ms >> 64 bytes from ftp.de.debian.org <http://ftp.de.debian.org> >> (141.76.2.4): icmp_seq=2 ttl=44 time=40.9 ms >> ^C >> --- ftp.de.debian.org <http://ftp.de.debian.org> ping statistics --- >> 2 packets transmitted, 2 received, 0% packet loss, time 1005ms >> rtt min/avg/max/mdev = 40.926/46.083/51.240/5.157 ms >> >> So, yes, this looks like it is the same for everybody. But you can use >> another URL. >> >> >> Thanks. I have decided to be Canadian for my Debian mirror today :). >> > Why not. I often switch when it goes down. But I like using the german > one. I don't know if it is in Germany, but it looks like more reliable. > Normal, you would say; German discipline. > > > The mirror is located in Germany, at Technische Universität Dresden. |