Transfer speeds to/from datacenter in Germany

Forums › Spark New Zealand (including Skinny and BigPipe) › Transfer speeds to/from datacenter in Germany

gareth41

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#285730 13-May-2021 19:19

I have been transferring data to/from a server sitting in a datacenter in Germany lately. When uploading files I can only manage to achieve 2Mbits or thereabouts using a single connection, however if I use multiple connections then I can achieve a faster combined upload speed. However downloading from this server, I'm getting upwards of 100Mbits without any issue at all using a single connection. It's not the server at the other end - so I've been told. Any reason for this? I'm assuming it possibly something to do with the CIR on my Spark fibre connection? I'm on Fibre max.

KiwiSurfer

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#2707163 13-May-2021 20:08

Are you sure it's 2 megabits per second and not 2 megabytes per second?

If your upload is 20mbits/sec, that's around 2.5mbytes/sec so may explain what you're seeing if you've not taken into account the unit conversion.

gareth41

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#2707192 13-May-2021 21:01

Yes, can confirm its 2mbits/s, around 220kbyte/s per connection.

Talkiet

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#2707213 13-May-2021 21:47

I can guarantee you it's nothing to do with any CIR on FibreMax. What sort of upload speeds do you get to other servers in Germany? Given it's about as far away as it's possible to get, the 300 odd ms latency does horrible things to TCP performance with most TCP CA algorithms insofar as single thread performance goes. When testing, I am getting 30-40Mbps uyload to German speedtest.net servers but that will be multithread.

Cheers - N

Please note all comments are from my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.

fe31nz

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#2707244 13-May-2021 23:54

Is this from a Windows box? If so, try a Linux box. The Linux TCP/IP stack generally adapts much better to big ping times. If you do not have a Linux box, download one of the live Linux images and boot the PC from USB with that and see how fast it can upload. I find that my Ubuntu 20.04 box is way faster on download and upload to far away places, and does it with a single down/upload thread. Windows is only OK to Australia from here.

Using a multi-threaded upload or download program is generally the only way to get reasonable speeds on Windows, but even then I have had problems with the speed suddenly going down to nearly zero before recovering after a short while and doing that repeatedly.

yitz

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#2707289 14-May-2021 00:10

Had 2 VMs at the same Azure location, Windows one would do about 50-100 kB/s while Linux once TCP BBR enabled was more like 50 MB/s 👌
That was download though, uploading was a bit better but many sawtooths. Mind you it was 1 GB VM lol