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Alexander Motin
b16e096198
Small block workloads may use a very large number of dirty records. During simple block cloning test due to BRT still using 4KB blocks I can easily see up to 2.5M of those used. Before this change dbuf_dirty_record_t structures representing them were allocated via kmem_zalloc(), that rounded their size up to 512 bytes. Introduction of specialized kmem cache allows to reduce the size from 512 to 408 bytes. Additionally, since override and raw params in dirty records are mutually exclusive, puting them into a union allows to reduce structure size down to 368 bytes, increasing the saving to 28%, that can be a 0.5GB or more of RAM. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #16694
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.