fwiw i got a friend in kansas, to do some downloads from NZ, and it was around 2 megabytes/sec over vocus, 3 megabytes/sec over telstraclear. although he had a mac, and i needed to help him tune some tcp settings to get throughput up. so same thing is likely to apply in reverse, with needing to tune settings for throughput if using a mac. forgot what those settings were...
fortunately skype remembers things forever:
sudo sysctl -w net.inet.tcp.recvspace=262144
seemed to improve things for him.
although he got that strange behaviour i've seen before and described it a bit better than i do:
umm it does an initial climb peaks at some point, drops, then rapidly climbs back up and exceeds the previous peak
unsignedint: I'm on UFB 30/10 and international speeds are great. Quite easy to max out my line, with a single thread. Below is a download of a linux ISO form California, US @ 3.2MB/s on WiFi.
I agree that 2-3MB/s may be a typical max speed when pulling traffic into NZ but this doesn't mean it can't go faster if there is less other traffic (anywhere between here and the server) if TCP is tuned at both ends. The question for this thread is what speeds can Snap users expect and we have some answers.
I know it is possible to pull 100Mbps (12MB/s), single threaded, from more distant servers on another ISP and I believe Snap users in the past have also had higher speeds. How it performs for the average user is the current question. It is difficult to differentiate between Snap as an ISP and the remote web server delivery which I think can often be the limit once at speeds like 2-3MB/s.
Okay, I take it back, you guys were quite right. I've just realised that the box here I normally do transfers to/from had a low TCP maximum receive buffer. I ass-umed that it would be sane after looking at the values on another very similar install. Odd how they all end up with different values.
hads: Okay, I take it back, you guys were quite right. I've just realised that the box here I normally do transfers to/from had a low TCP maximum receive buffer. I ass-umed that it would be sane after looking at the values on another very similar install. Odd how they all end up with different values.
So after increasing from 903744 to 6291456
It's based on memory size.
Basically the TCP/IP window size is half the value of that number, and the rest is socket buffer.
So that's a 3 megabyte buffer or thereabouts, so should be fine to Europe even. I've found that not having too big a buffer can mean you're more likely to get good speeds more frequently though, as sometimes bursts are too big, and packets get dropped. Like if you halved it you'd probably get similar speed to that location, but maybe slower to Europe.
That said, that's some pretty nice speed there. :)
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hads: You mean that the default value is based on system memory size?
That's odd because cobalt (the box with the lower default of 903744) has 32GB and lithium (the box with the larger default of 6291456) has 16GB.
And yeah, it sure is. I just got more impressed with the UFB connection :)
that's curious. i think 4gb gives decent window sizes normally. it may be something to do with the kernel version on the 32gb box.
i just set mine manually in /etc/sysctl.conf though, sticking the wmem down can help too, especially when having bad upload speed and bufferbloat on router.
although in your situation it looks like you may want to raise it slightly.
hads: I can max out my 100Mbit USB connection to a NZ based server but with real world transfers (rsync/HTTP) from the US I see a max of around 2-2.5MB/s.
Pulling that same file just now shows around 1.8MB/s;
4/4 connections on this file yields max line speed (12.11avg MB/s); 1/1 was just above 4.5MB/s
International speeds for me are always max line or close to it (100mb/50mb) if i'm over 4/4 connections.
Few example sites are: (HTTP Transfers)
Uploaded.net 30 odd servers located in Germany, Paris and Dallas (company ones). Crapidshare.com Sourceforge (u.s. mirrors)
Infact, I barely see my torrents downloading at less than 10MB/s.
Loving my snap connection, for both national and international speeds and latency, with no ping fluctuations and 0.02kb/s randomly like slingshot was :P
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