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Dalton Moore avatar Ubuntu

Slow USB3 read rates after kernel update on Ubuntu 20.04 and 22.04

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Dalton Moore

I have encountered a problem with USB3 read speeds which has occurred on three different computers, all shortly after an Ubuntu kernel update. I discovered this problem through the use of a video data acquisition system with high speed cameras saving .raw images over USB3 connections (using FLIR blackfly s cameras, in case that is helpful). On three different computers, I have used the same python code-base to acquire video data for years without any USB3 read speed issues. All three computers have had an automatic update sometime in the last few months. Since then, the USB3 bus will briefly read data coming in from a camera at the appropriate data rate, then drop down to ~30 Mb/s. The appropriate rate would be ~100Mb/s for one of these systems, and higher for higher frame rates on our most high-tech machine. I have also tested read speeds of the same image files from a USB flash drive and the rates seem to do the same thing - start high, drop almost immediately.

The updated kernel is linux-5.15.0-58. I have tried upgrading from Ubuntu 20.04 LTS to 22.04 LTS, but this did not fix the issue.

Any advice anyone can provide will be much appreciated. Please let me know of any extra information you need.

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