The Latest On The Linux 5.9 Kernel Regression Stemming From Page Lock Fairness

Written by Michael Larabel in Software on 13 September 2020. Page 3 of 4. 41 Comments

It was also brought up by Linux kernel developer Matthew Wilcox that XFS might be even more impacted than EXT4 that was the file-system used so far with my Linux 5.9 testing. So I then fired up some cross-filesystem benchmarks this weekend between 5.8 and 5.9 Git. Indeed, there are some differences.

With Hackbench, the Btrfs file-system ends up being hurt the most with Linux 5.9 for this test case and then EXT4 while XFS and F2FS saw less of an impact but still big.

When running Apache, the XFS performance indeed fell the most where as on Linux 5.8 it had a nice lead over the other file-systems while with Linux 5.9 Git it's bottlenecked and in line with the other file-systems.

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