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Alexander Motin
bd7a02c251
We should not always use PAGESIZE alignment for caches bigger than it and SPA_MINBLOCKSIZE otherwise. Doing that caches for 5, 6, 7, 10 and 14KB rounded up to 8, 12 and 16KB respectively make no sense. Instead specify as alignment the biggest power-of-2 divisor. This way 2KB and 6KB caches are both aligned to 2KB, while 4KB and 8KB are aligned to 4KB. Reduce number of caches to half-power of 2 instead of quarter-power of 2. This removes caches difficult for underlying allocators to fit into page-granular slabs, such as: 2.5, 3.5, 5, 7, 10KB, etc. Since these caches are mostly used for transient allocations like ZIOs and small DBUF cache it does not worth being too aggressive. Due to the above alignment issue some of those caches were not working properly any way. 6KB cache now finally has a chance to work right, placing 2 buffers into 3 pages, that makes sense. Remove explicit alignment in Linux user-space case. I don't think it should be needed any more with the above fixes. As result on FreeBSD instead of such numbers of pages per slab: vm.uma.zio_buf_comb_16384.keg.ppera: 4 vm.uma.zio_buf_comb_14336.keg.ppera: 4 vm.uma.zio_buf_comb_12288.keg.ppera: 3 vm.uma.zio_buf_comb_10240.keg.ppera: 3 vm.uma.zio_buf_comb_8192.keg.ppera: 2 vm.uma.zio_buf_comb_7168.keg.ppera: 2 vm.uma.zio_buf_comb_6144.keg.ppera: 2 <= Broken vm.uma.zio_buf_comb_5120.keg.ppera: 2 vm.uma.zio_buf_comb_4096.keg.ppera: 1 vm.uma.zio_buf_comb_3584.keg.ppera: 7 <= Hard to free vm.uma.zio_buf_comb_3072.keg.ppera: 3 vm.uma.zio_buf_comb_2560.keg.ppera: 2 vm.uma.zio_buf_comb_2048.keg.ppera: 1 vm.uma.zio_buf_comb_1536.keg.ppera: 2 vm.uma.zio_buf_comb_1024.keg.ppera: 1 vm.uma.zio_buf_comb_512.keg.ppera: 1 I am now getting such: vm.uma.zio_buf_comb_16384.keg.ppera: 4 vm.uma.zio_buf_comb_12288.keg.ppera: 3 vm.uma.zio_buf_comb_8192.keg.ppera: 2 vm.uma.zio_buf_comb_6144.keg.ppera: 3 <= Fixed, 2 in 3 pages vm.uma.zio_buf_comb_4096.keg.ppera: 1 vm.uma.zio_buf_comb_3072.keg.ppera: 3 vm.uma.zio_buf_comb_2048.keg.ppera: 1 vm.uma.zio_buf_comb_1536.keg.ppera: 2 vm.uma.zio_buf_comb_1024.keg.ppera: 1 vm.uma.zio_buf_comb_512.keg.ppera: 1 Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15452
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.