<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Tue, Aug 13, 2013 at 7:09 AM, Marko Vojinovic <span dir="ltr"><<a href="mailto:vvmarko@gmail.com" target="_blank">vvmarko@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hi folks! :-)<br>
<br>
Before I go complain to my ISP, I'd like to hear if anyone can give me<br>
an idea what is going on with my networks... :-)<br>
<br>
I have two machines, with following link properties:<br>
<br>
local --- 20Mbps/2Mbps (GSM wireless)<br>
remote --- 100Mbps/100Mbps (100Mbit LAN connected to optical uplink)<br></blockquote><div><br></div><div>I assume that the local is connected to a cable service ISP.<br></div><div>Cable service dpeeds are generally not guaranteed, and depend on other<br>
</div><div>users on the same cable segment, whom you know nothing about.<br></div><div><br></div><div>Perhaps you would get better download speeds from remote to local<br></div><div>if you tried it after local midnight.<br>
</div><div> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
The remote machine is in another country, cca 2000 km away. It is<br>
connected to a 10Gbit optical link, but only through a 100Mbps switch,<br>
so that caps the bandwidth.<br>
<br>
When transferring large files via wget from remote to local, the<br>
maximum bandwidth that I get is 2Mbps. It *used to be* 20Mbps (couple<br>
of days ago). Occasionally it drops down to 300Kbps (it just happened<br>
as I write this), but after several minutes it gets back up to 2Mbps.<br></blockquote><div><br></div><div>If it "used to be" 20 Mbps, perhaps a new user has come online on<br></div><div>your cable segment.<br></div>
<div> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
But it doesn't want to get back up to 20Mbps, which is the max download<br>
throughput for the local machine.<br>
<br>
To test the local link, I opened 15-20 random youtube links<br>
simultaneously in Firefox. It easily capped the full 20Mbps, so the<br>
local link apparently works as advertised.<br></blockquote><div><br></div><div>Here you are doing multiple downloads, not just one. I don't know<br>whether that makes a difference or not.<br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Another test of the local link --- I went to<br>
<br>
<a href="http://fedoraproject.org/get-fedora" target="_blank">http://fedoraproject.org/get-fedora</a><br>
<br>
and clicked the big blue "download now" button, to download the Live<br>
Desktop .iso --- the download manager in Firefox says it will complete<br>
it in 17 hours, since it is downloading at 15 KBps (i.e. 150 Kbps).<br>
This is of course ridiculously slow, for a 20Mbps link.<br></blockquote><div><br></div><div>This is a better comparison: one download stream.<br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
All speed numbers are consistently reported by jnettop, KDE network<br>
widget, Firefox download manager and wget. If you suggest some other<br>
tool to measure the throughput, I'll try it out too.<br>
<br>
The remote machine appears to work ok --- I have downloaded and<br>
uploaded (elsewhere) all sorts of things, and it consistently works at<br>
100Mbps up/down. Downloaded Fedora DVD iso in a couple of minutes. I<br>
can seed torrents from it at 100Mbps no problem (this is currently off<br>
because I'm trying to pull something to the local machine).<br>
<br>
So I believe something is wrong with my local link, but don't know<br>
exactly what --- youtube works, but other things don't.<br>
<br>
Any ideas how to troubleshoot this?<br>
<br>
Also, any ideas what to tell to my ISP?<br></blockquote><div><br></div><div>Ask them about service speed guarantees. They might have a guaranteed<br></div><div>speed service for a higher price.<br></div><div> <br></div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I could ask them to look into it, but they just might open a bunch of<br>
youtube links, verify that the link works, and blame the remote machine.<br>
<br>
Any suggestions appreciated.<br>
<br>
TIA, :-)<br>
Marko<br>
<br>
P.S. Before anyone asks --- I *do* know the difference between bits and<br>
bytes, Mbps and MBps, etc. I was careful to provide you with a<br>
case-sensitive units, and I know what I'm talking about. :-)<span class="HOEnZb"></span><br clear="all"></blockquote></div><br>-- <br>Dale Dellutri
</div></div>