Тег: hammer2

"DragonFly version 6.0 is the next step from the 5.8 release series in 2020. This version has a revamped VFS caching system, various filesystem updates including HAMMER2, and a long list of userland updates. The details of all commits between the 5.8 and 6.0 branches are available in the associated commit messages for 6.0.0rc1 and 6.0.0. Big-ticket items: Significant work on dsynth, for building packages. Many updates of contrib system software. HAMMER2 work continues, with updates from Tomohiro Kusumi. Major VM work for extent-based representation. Due to major changes to the VM system we had to remove the MAP_VPAGETABLE mmap() feature, and this also means that vkernels will not be supported in this release. Support may be re-added at a later time via HVM (but not in this release)."

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"DragonFly version 5.2 brings Meltdown/Spectre mitigation, significant improvements to HAMMER2, ipfw, and graphics acceleration.... Big-ticket items: Meltdown and Spectre mitigation support; Meltdown isolation and Spectre mitigation support added. Meltdown mitigation is automatically enabled for all Intel CPUs. Spectre mitigation must be enabled manually via sysctl if desired, using sysctls machdep.spectre_mitigation and machdep.meltdown_mitigation. HAMMER2 - H2 has received a very large number of bug fixes and performance improvements. We can now recommend H2 as the default root file system in non-clustered mode. Clustered support is not yet available."

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