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Brian Behlendorf
505df8d133
Incorrectly sizing the array of hash locks used to protect the dbuf hash table can lead to contention and reduce performance. We could unconditionally allocate a larger array for the locks but it's wasteful, particularly for a low-memory system. Instead, dynamically allocate the array of locks and scale it based on total system memory. Additionally, add a new `dbuf_mutex_cache_shift` module option which can be used to override the hash lock array size. This is disabled by default (dbuf_mutex_hash_shift=0) and can only be set at module load time. The minimum target array size is set to 8192, this matches the current constant value. Note that the count of the dbuf hash table and count of the mutex array were added to the /proc/spl/kstat/zfs/dbufstats kstat. Finally, this change removes the _KERNEL conditional checks. These were not required since for the user space build there is no difference between the kmem and vmem interfaces. Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #13928
OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.