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I've had interesting networking experience before. Before I moved, I've had a VDSL connection, with 3mb uplink. (The down speed was around 30mb but is not relevant at this moment). Whenever I saturated the uplink (CrashPlan backup), I could see a slowdown in general latency and responsiveness, but I could still use the internet without any major issue.
Now, I've moved to a place further away, where I only get normal ADSL+. The speed is 10mb downlink with 1mb uplink. The problem is, however, that whenever I saturate the uplink almost everything grinds to a halt - ping times are climbing to tens of seconds and the general experience is pretty bad. Even if I utilise only 50% of the upload speed, the latency grows to 500-800ms.
At first, I attributed the problem to the decreased connection quality - however, now I think that it's a configuration/networking problem on my provider side and has nothing to do with the quality of the copper coming my way. What further re-assured this belief is that a friend of mine has a connection with similar parameters (another area but similar distance to the exchange) and he can happily saturate the upload without compromising the overall connectivity!
So, what could be the problem? Is this the famous Bufferbloat problem? If so, is there a way to mitigate it? The tech support just tells me to make sure I am not using the upload too much in order to ensure connectivity... which is weak in my book.
I was also looking into some of the tomato firmware router, any advice on this? I've tried all possible QoS settings to give the backup software lower priority but this only fixes the issue partially.
So, to sum up - do you think it is a bufferbloat and if so, how to fix it? (other than changing providers)
Not sure if it works for Tomato, but give it a try :-) #tc qdisc add dev eth0 root fq_codel – user – 2015-04-15T15:51:12.260
How did you did do the 50% upload speed test - using UDP or TCP based tool? – Pierz – 2019-06-19T14:26:58.763
Well, the Wikipedia link does state ways to solve it, if it relates to bufferbloat. Have you checked if this problem occurs in other machines (maybe a laptop, a clean installation, if possible). As a last resort you could ask your ISP for a replacement router/modem. Please add more information about your machine and your hardware. – Doktoro Reichard – 2013-10-15T20:08:39.287
I've applied test found here: http://www.chizang.net/alex/blog/2012/07/24/bufferbloat-for-the-impatient/ ... Testing was done using multiple machines including clean installs on raspberry pi - every time buffer fills, latency skyrockets
– petr – 2013-10-15T20:48:17.440