Now that I recently upgraded my internet connection to 25 Gbit/s, I was curious how hard or easy it is to download files via HTTP and HTTPS over a 25

25 Gbit/s HTTP and HTTPS download speeds - Michael Stapelberg

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2022-05-14 14:30:06

Now that I recently upgraded my internet connection to 25 Gbit/s, I was curious how hard or easy it is to download files via HTTP and HTTPS over a 25 Gbit/s link. I don’t have another 25 Gbit/s connected machine other than my router, so I decided to build a little lab for tests like these 🧑‍🔬

To connect it to my router, I ordered a MikroTik XS+DA0003 SFP28/SFP+ Direct Attach Cable (DAC) with it. I installed the network card into my old workstation (on the right) and connected it with the 25 Gbit/s DAC to router7 (on the left):

Before taking any measurements, I do one full download so that the file contents are entirely in the Linux page cache, and the measurements therefore no longer contain the speed of the disk.

big.img in the tests below refers to the 35 GB test file I’m downloading, which consists of distri-disk.img repeated 5 times.

In terms of download speeds, there is no difference with or without KTLS. But, enabling KTLS noticeably reduces CPU usage, from ≈10% to a steady 2%.