https://bugzilla.suse.com/show_bug.cgi?id=1194268

Bug ID: 1194268 Summary: disable btrfs asserts in default kernels Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: kernel-bugs@opensuse.org Reporter: dmueller@suse.com QA Contact: qa-bugs@suse.de Found By: --- Blocker: ---

while chasing for I/O performance issues in virtualized environments (usecase Open Build Service package builds for example), I noticed that btrfs in our default kernel has asserts enabled. according to the Kconfig help setting, this setting is purely for development purposes.

I suggested to move the setting CONFIG_BTRFS_ASSERT only into the debug flavors, however there was concerns that this affects finding memory corruptions and other hardware related issues.

On the other side, in my brief testing it appeared disabling reduced code size noticeably (in dual-digit percentage range) and also improved IOPS on a FIO randrw test (on a cow file) by over 20%. I will replicate the tests to be sure.

This bug is to track how to address the issue and making asserts purely developer only and disable them in production builds of the openSUSE distribution.