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While use of dynamic taskqs allows to reduce number of idle threads, hardcoded 8 taskqs of each kind is a big overkill for small systems, complicating CPU scheduling, increasing I/O reorder, etc, while providing no real locking benefits, just not needed there. On another side, 12*8 worker threads per kind are able to overload almost any system nowadays. For example, pool of several fast SSDs with SHA256 checksum makes system barely responsive during scrub, or with dedup enabled barely responsive during large file deletion. To address both problems this patch introduces ZTI_SCALE macro, alike to ZTI_BATCH, but with multiple taskqs, depending on number of CPUs, to be used in places where lock scalability is needed, while request ordering is not so much. The code is made to create new taskq for ~6 worker threads (less for small systems, but more for very large) up to 80% of CPU cores (previous 75% was not good for rounding down). Both number of threads and threads per taskq are now tunable in case somebody really wants to use all of system power for ZFS. While obviously some benchmarks show small peak performance reduction (not so big really, especially on systems with SMT, where use of the second threads does not give as much performance as the first ones), they also show dramatic latency reduction and much more smooth user- space operation in case of high CPU usage by ZFS. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #11966 |
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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.