BtrFS performance regression found in kernel version 5.10
A Reddit user reported slower I/O on his btrfs system after updating the kernel to version 5.10. I found a very simple way to reproduce the regression, namely by extracting a huge tarball, for example: tar xf firefox-84.0.source.tar.zst. On my external USB3 SSD on a Ryzen 5950x it took from ~15s on the 5.9 kernel to almost 5 minutes on 5.10! […]