It sounds like they really ran afoul of the stable page writes bugs that exist in Linux 3.2.31 to 3.9. Thread discussing the bug and a test program to show the

It sounds like they really ran afoul of the stable page writes bugs that exist in Linux 3.2.31 to 3.9. Thread discussing the bug and a test program to show the issue. https://lkml.org/lkml/2012/10/9/210 https://lkml.org/lkml/2012/10/9/210 Patch introducing the bug: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/?id=3d08bcc887a1c8d12be8d81f747ffa2e8a44b67b https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.... Patch fixing the bug: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/?id=1d1d1a767206fbe5d4c69493b7e6d2a8d08cc0a0 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.... It causes a huge dropoff in latency and throughput by causing all filesystems to block even when they don't need to. In short, 3.2 is lethally bad in terms of database workloads.