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When ZFS appends files in chunks bigger than recordsize, it borrows buffer from ARC and fills it before opening transaction. This supposed to help in case of page faults to not hold transaction open indefinitely. The problem appears when recordsize is set lower than default 128KB. Since each block is committed in separate transaction, per-transaction overhead becomes significant, and what is even worse, active use of of per-dataset and per-pool locks to protect space use accounting for each transaction badly hurts the code SMP scalability. The same transaction size limitation applies in case of file rewrite, but without even excuse of buffer borrowing. To address the issue, disable the borrowing mechanism if recordsize is smaller than default and the write request is 4x bigger than it. In such case writes up to 32MB are executed in single transaction, that dramatically reduces overhead and lock contention. Since the borrowing mechanism is not used for file rewrites, and it was never used by zvols, which seem to work fine, I don't think this change should create significant problems, partially because in addition to the borrowing mechanism there are also used pre-faults. My tests with 4/8 threads writing several files same time on datasets with 32KB recordsize in 1MB requests show reduction of CPU usage by the user threads by 25-35%. I would measure it in GB/s, but at that block size we are now limited by the lock contention of single write issue taskqueue, which is a separate problem we are going to work on. Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #14964 |
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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 12.2-RELEASE.