Linked by Thom Holwerda on Wed 27th Apr 2011 21:25 UTC, submitted by foldingstock
BSD and Darwin derivatives This release supports a much larger variety of hardware and multiprocessor systems than previous releases, thanks to updates of ACPI and APIC and ACPI interrupt routing support. Hammer volumes can now deduplicate volumes overnight in a batch process and during live operation. The 'hammer dedup-simulate' command can be used to estimate space savings for existing data. DragonFly now uses gcc 4.4 as the default system compiler, and is the first BSD to take that step. DragonFly now offers significant performance gains over previous releases, especially for machines using AHCI or implementing swapcache(8).
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FreeBSD ( ) beat DragonFlyBSD ( ) to a self-hosting clang-built kernel by about 3 weeks. Both of which were well ahead of Linux ( ). Apple made the transition to Clang with the Snow Leopard release in June of 2009. While it may seem reasonable to assume that Apple had internal builds going well before 4-5 months in advance, the blockers that were fixed in Clang and allowed these BSD derived kernels to build and boot were fixed in early 2009 -- OSX was probably building and booting in the same timeframe as FreeBSD and DragonFly.

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