[LINK] South American FTTH - my experience + http per session throttling

[Paul Brooks]

On 28/05/2012 6:43 AM, Fernando Cassia wrote:
> However, I started discovering the ugly truth: this telco seems to be doing
> bandwidth throttling per http connection. Ie. you can´t get more than 2.5
> to 3Mbit down per http session on international downloads.
>
> If I download a single file, ie latest Java from Java.com, I get 2.5 to
> 3Mbit. If I open multiple simultaneous downloads, each http connection gets
> its 2.5 to 3Mbit. So if I open 4 simultaneous downloads, I saturate the 10
> Mbit link.
>
> This is the same for every big file downloads from international servers
> I´ve tried. (Apache OpenOffice, etc)
>
> Still not sure if this is the local ISP doing it, or the upstream
> international provider of its uplink (which would be Telmex, or any
> American ISP that provides it with its peering agreement).
>
> Instead, if I download from .edu.ar, or .com.ar, or gov.ar, I get the full
> 10 Mbit for a single http download. IE I downloaded the latest Ubuntu ISO
> from ftp.uba.ar at 9.8 Mbits.
>
> Of course, if I download a torrent download, the several simultaneous
> downloads of file fragments also saturate the 10 Mbit. So this is a
> nuisance only for individual big file downloads done with the browser.
>
> Strange and odd.
>
> Upstream on the other hand doesn´t seem to be limited in any way...
>
> Thoughts? Comments? is this throlling per http session a common practice?
> Or should I demand I get the full speed for EACH http session?.

Fernando - they may be throttling, or you could be running into bandwidth-delay limits
caused by your platform having a limited reception buffer, and a long round-trip-time
path.
Perhaps try downloads from international servers at varying 'distances' / network
delays, and recording the ping time along with your download speed.
Try servers in Brazil, US west coast, US east coast, canada, a couple of places in
Europe, and of course Australia and New Zealand.
If  further international sites run slower than closer ones, its your machine that
needs to be tuned to use bigger TCP buffers - https://en.wikipedia.org/wiki/TCP_tuning.
If the speed is identical for all distances, then your ISP is probably throttling you.

Do you have access to other machines with different OS, and do they show the same
speeds from the same sources?

P.








>
> FC
> _______________________________________________
> Link mailing list
> Link at mailman.anu.edu.au
> http://mailman.anu.edu.au/mailman/listinfo/link