Hello I have been badly hit by a performance problem in mod_dav_fs. After a few users updated to (RaiDrive/2022.6.56.0), all users reported terrible performance, with files taking age to open.
Investigating the problem, we discovered lock contention of the DavLockDB file. Too many clients looking up locks, too often. A log analysis show that RaiDrive/2022.6.56.0 does much more PROPFIND than other clients. PROPFIND involves lock discovery, and lock discovery needs serialized access to DavLockDB. I submitted a proposed fix in https://bz.apache.org/bugzilla/show_bug.cgi?id=66313 I This introduces a DAVLockDiscovery option to optionaly disable lock discovery. It uses an apache expession so that the thing can be fine tuned, e.g. disabling it for specific UserAgent that exhibit an abusive behavior. When lock discovery is disabled, PROPFIND just returns an empty lock discovery section. I have been testing disabling lock discovery for a week, it works well. Performances are good again, and no regression appeared. -- Emmanuel Dreyfus m...@netbsd.org
