At what point does upload hinder download?

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ghettomaster

387 posts

Ultimate Geek

#205058 28-Oct-2016 09:46

Hi,

I was playing around with speedtest last night and saw that I was only getting 7Mbps down and 0.2Mbps up, when I used to get 15 down and 1 up. I jumped into the modem and discovered it is syncing at 11Mbps down and 0.3Mbps up.

This made me wonder - what upload speed / ratio is required for ACK packets? I know this is a little bit of an open question so let's keep it to running a speedtest or downloading a file over HTTP. Also, are there any factors such as faster or slower speeds that might influence the required ratio?

BTW I am not worried about diagnosing the connection issue. I just ordered FibreX so the DSL is going in a couple of days.

Talkiet

4793 posts

Uber Geek

Trusted

#1659530 28-Oct-2016 10:11

Depends on many things. TCP stacks differ between operating systems and versions of operating systems and they will have an impact on the up/down ratio. Some forms of encapsulation and VPNs can also dramatically change things.

A good clean 200kbit/sec should be enough to support 10Mbps download in many cases, but I have no doubt that in some scenarios it won't be enough.No easy answer sorry.

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.

ghettomaster

387 posts

Ultimate Geek

#1659710 28-Oct-2016 12:49

Thanks for the answer talkeit - certainly enough to satisfy my curiosity.

Jase2985

13465 posts

Uber Geek

ID Verified

Lifetime subscriber

#1659938 28-Oct-2016 17:16

7.8MB/s (62.4mbps) down and 180-200KB/s (1.44-1.6mbps) up on my VDSL connection

YMMV