![]() Reduce the bandwidth for all Netflix servers to 5mbps and suddenly you're stuck watching at 480p or 720p, even if the connection can handle multiple 4k streams. Netflix and Google (YouTube) are commercial entities that ISPs will intentionally throttle. It's possible that those are affecting your measurements at very high speeds. Netflix's speedtest is mostly reliable for what it's meant to do, which is solve the question of "my internet is fast but Netflix keeps buffering".Įdit: another factor to consider is that accurate timing has been disabled in most browsers because of side channel attacks like SPECTRE. If you're your own ISP you can make it happen, but on the other hand you'll probably also know how to get statistics directly from your network hardware, in which case the numbers are useless but it still becomes a useful way to spike the load. No way in hell is Netflix going to allow your single home internet connection to somehow pull in a full gigabit of streaming video. Their compensation makes for some hilarious statistics, but when you're downloading more than 200mbps the speedtest doesn't make much sense anyway. In my experience, the WiFi throughput numbers seem spot on. It's hard to guesstimate the exact bandwidth of the data that arrives in your browser because of differences in protocol, MTU, header compression and all that nonsense, especially over technologies like WiFi. Bandwidth includes every bit on the wire and that's why "940mbps" internet is usually just normal gigabit with a bunch of packet headers and intentionally unused transmit space consuming the phantom 60mbps. The servers can sustain throughput around 10 Gbps, as an example, here is a wget from another host in Tele2's network: 100% 100.00G 1. seemingly tries to compensate for the overhead. If a server should fail, users would be served by the second closest server. In addition to simply serving users using the closest server, anycast also enables basic load balancing and redundancy as users in different areas are served by their closest server, spreading the load over all of our installations. Our primary network metric is latency and therefore the closest network distance is typically the closest node geographically but there are situations where ineffecient fiber routing or cuts could lead to you being served by a node further away. Do note how "closest" is not measured geographically but rather by what our networks thinks is the closest location. Tele2 speedtest service utilizes this to send you to the closest location in our network. Sparse files, such as the ones provided here via HTTP and FTP, can be created with something along the lines of: dd if=/dev/zero of=my_large_file bs=1 count=0 seek=10GĪnycasting is a technique where a single IP address is used in multiple locations in a network and packets are sent to the closest server. ![]() ![]() TCP windows have been slightly tweaked to support higher throughput. A small script called cleandir is used to clean the upload directory of the FTP server to avoid filling the file system with temporary uploaded files. Debian Linux is the operating system used, nginx for serving web pages and sparse files via HTTP and vsftpd is used for FTP. ![]() Each location consists of a 1U Supermicro server with an octacore Xeon E3-1240 V2 running at 3.4GHz, 32GB of RAM and an Intel 10GE NIC (82579LM chip). ![]() This page and the listed speedtest services are hosted on a number of servers spread through Europe (see locations). ![]()
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