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The introduction of ARC multilists made L2ARC writing quite random, depending on whether it found something to write in a randomly selected sublist. This created inconsistent write patterns and poor utilization of available sublists leading to uneven cache population. This commit replaces random selection with systematic scanning across all sublists within each burst. Fair headroom distribution ensures even-depth traversal across all sublists until the target write size is reached. Round-robin processing with random starting points eliminates sequential bias while maintaining predictable write behavior. The systematic approach provides consistent L2ARC filling patterns and better utilization of available ARC data across all sublists. Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ameer Hamza <ahamza@ixsystems.com> Closes #18093 |
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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 13.0-RELEASE.
