Why does uploading a file kill download speed

Yeah, this model had it, but it was turned off. Anyway, long since replaced it with a better one. The primary downstream cable connection is great. We can stream music and a couple videos at the same time without a hiccup.

But both crap out as soon as an upload starts. As far as testing, we routinely move GBs between computers. The connection goes through the router, then through two different D-Link Gigabyte switches—to understand the suggestion, the test would be to add a NAS device directly to the router, then pull a giant file from it by one of a computer also directly attached to the router, and see if that messes up the hole-house Internet?

Not necessarily. You might look into a better cable modem; the junk that Comcast, Cox et al. Provider is Comcast. That said, how does the modem figure into this? Is it possible that my router is passing on so many upload packets that its overloading the modem? Modems vary a lot, and the Arris stuff they provide is pretty low-end and prone to glitching and failures.

Chances are you are very nearly maxing out the upload bandwidth. I had a problem like this, and it turned out to be on their end, not mine. What this means is that you can download at 20 Mbps and upload at 5 Mbps. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

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Asked 9 years, 10 months ago. Active 3 years, 3 months ago. Viewed 18k times. Improve this question. Jim McKeeth.

I'd avoid anything that's greater than 16 specifically because of what you're experiencing right now and even 16 is a bit too much. AndrejaKo: Yeah, I wish they offered a faster upload speed. My only option is to take a slower download speed. Add a comment.

Active Oldest Votes. Improve this answer. So are you suggesting that because I am maxing out my upload pipe I am not able to make requests to download content simultaneously? That's essentially it. The TCP protocol, which is also used for Web uploads, will try to max out the link as much as it can when the ACKs messages are continuously flowing in.

When the ACK messages start to go missing or exceed a delay threshold , the sender will slow the transmission down dramatically and later gradually increase speed until the channel is saturated again. I used to use cfosspeed. Also, to directly limit bandwidth per process, you can use NetLimiter. Many years ago I had my own bsd gateway server at home, and I graphed how this looks like: kesor.

Show 1 more comment. You have two things going on here: Your uploading to a server, which is using most of your upload bandwidth and a bit of your download bandwidth to talk to the server to ensure the file is being received properly. See the issue?

In short, Yes : — zackrspv. I do expect somewhat of a hit on the download speed when uploading, but it should not be half. I will continue to look into this, but at least I have something working now with it disabled.

Contact your service provider to talk about increasing the upload rate or changing your Internet plan if your office needs a faster connection. Most broadband Internet connections have dedicated bandwidth for both uploads and downloads. But with a cellular network plan, like a 3G, 4G or LTE connection, bandwidth is all lumped in together. If you're uploading something on this type of connection, expect it to subtract from your download speed.

Living in Canada, Andrew Aarons has been writing professionally since He holds a Bachelor of Arts in English literature from the University of Ottawa, where he served as a writer and editor for the university newspaper. Aarons is also a certified computer-support technician.