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Alexander Motin
f7e6dcc68d
It makes no sense to limit read size below the block size, since DMU will any way consume resources for the whole block, while the current zfs_vnops_read_chunk_size is only 1MB, which is smaller that maximum block size of 16MB. Plus in case of misaligned Uncached I/O the buffer may get evicted between the chunks, requiring repeating I/Os. On 64-bit platforms increase zfs_vnops_read_chunk_size to 32MB. It allows to less depend on speculative prefetcher if application requests specific size, first not waiting for prefetcher to start and later not prefetching more than needed. Also while there, we don't need to align reads to the chunk size, but only to a block size, which is smaller and so more forgiving. My profiles show ~4% of CPU time saving when reading 16MB blocks. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #17415
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.