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Building fast.com

techblog.netflix.com

11–20 of 180 posts

Re: Building fast.com

#11
First, I thought why another speed test, then I saw that they link their results directly to speedtest.net (the reference) and finally, I realized that fast.com is so much faster in detecting the download speed (but lacks upload and ping).

Not bad.

EDIT: And they secured a fantastic domain.

Re: Building fast.com

#12
post #8
post #7

Speed testing is a good starting point, but on my LTE connection (rural area) I find the latency to be very contributor to overall experience. Especially that once the link is saturated the latency shoots through the roof (up to x10). I wish there were some tools for testing more complex use cases.

Sounds like bufferbloat to me. Tried using smart queue management like fq_codel on your end? Or is it an overloaded LTE cell?

Not sure if bufferbloat, but happens across multiple machines and system versions (I can saturate the link with one machine, the others will still suffer). But it may be an issue with the LTE router. I don't think I can do anything about it as it is totally locked down by the ISP.

Re: Building fast.com

#13
post #2

1. When will someone build a tool like this and then open up the measurements data? A speed-measuring tool would be infinitely more useful if we could investigate the results beyond just our one device for one test. A question I really want to be able to answer: which ISP offers the fastest service in my area? fast.com and speedtest.net could easily answer this question if they made the data available. 2. I think tes…

>I think tests like this that rely on a built-out network and well-placed CDNs and such are probably junk. Depends on the goal - here Netflix wants to see how fast you can stream from their "built-out network and well placed CDNs" so testing those is completely relevant. For their purposes, testing a bunch of unoptimized and unrelated services would be "junk".

> here Netflix wants to see how fast you can stream from their [CDNs]

Absolutely right; but also in this case, Netflix' and the average downloader's needs align, given that the bulk (by share of bytes) of legal speed-sensitive downstream traffic is video.

Re: Building fast.com

#14
post #2

1. When will someone build a tool like this and then open up the measurements data? A speed-measuring tool would be infinitely more useful if we could investigate the results beyond just our one device for one test. A question I really want to be able to answer: which ISP offers the fastest service in my area? fast.com and speedtest.net could easily answer this question if they made the data available. 2. I think tes…

Google / YouTube has a 'Video Quality Report' which will measure your speeds and will also show local ISPs speeds as well.

https://www.google.com/get/videoqualityreport/

Re: Building fast.com

#15
post #2

1. When will someone build a tool like this and then open up the measurements data? A speed-measuring tool would be infinitely more useful if we could investigate the results beyond just our one device for one test. A question I really want to be able to answer: which ISP offers the fastest service in my area? fast.com and speedtest.net could easily answer this question if they made the data available. 2. I think tes…

Re:#1, I'd like to see some type of software we can install in our stacks, to publicly publish speed data in a standardized format for real data. Can you imagine `test.youtube.com`, `test.netflix.com` and `test.vimeo.com`? Hell, imagine how nice it would be for gamers? Having trouble with your ping? `test.csgo.com` (or whatever CounterStrikes domain is.. a popular FPS), and etc.

I'm firmly untrusting of Comcast's results on speedtest.. If Comcast is intentionally throttling, it's in their interest to not throttle Speedtest. However if we can monitor real data.. that actually seems useful.

I understand that would likely require additional resources from video/etc providers, and is likely an unrealistic request from video/etc providers.. but i definitely don't need more test sites for Comcast to manipulate.

Disclaimer: I don't know the subject domain, so apologies if i'm insanely off base.

Re: Building fast.com

#16

First, I thought why another speed test, then I saw that they link their results directly to speedtest.net (the reference) and finally, I realized that fast.com is so much faster in detecting the download speed (but lacks upload and ping). Not bad. EDIT: And they secured a fantastic domain.

Also, I'd imagine it's a way for them to fight back against providers capping download speeds to Netflix's content.

Re: Building fast.com

#18
post #2

1. When will someone build a tool like this and then open up the measurements data? A speed-measuring tool would be infinitely more useful if we could investigate the results beyond just our one device for one test. A question I really want to be able to answer: which ISP offers the fastest service in my area? fast.com and speedtest.net could easily answer this question if they made the data available. 2. I think tes…

We display our data publicly on the map. http://www.broadbandspeedchecker.co.uk/broadband_speed_in_my...

Granted we do not have many results in the US (maybe ballpark 200k+ results in last 6 months), still you should be able to find some results in your area.

Re: Building fast.com

#19
post #9
post #7

Speed testing is a good starting point, but on my LTE connection (rural area) I find the latency to be very contributor to overall experience. Especially that once the link is saturated the latency shoots through the roof (up to x10). I wish there were some tools for testing more complex use cases.

Latency is largely irrelevant to one-way video streaming (at least until it's so high it affects throughput), and since Netflix designed this to test your speed for their one-way video streaming service I think leaving out latency testing is reasonable.

Latency is critically important...

You can easily determine how much of a problem it is in your case by calculating your bandwidth delay product: https://en.wikipedia.org/wiki/Bandwidth-delay_product

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