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https://people.freebsd.org/~kuriyama/www/smp/index.html
The FreeBSD Symmetric MultiProcessing (SMP) project, often referred to as SMPng (SMP next generation), is focused on introducing parallelism into the FreeBSD kernel. While earlier versions of FreeBSD (3.x, 4.x) supported parallelism in user processes, the kernel was limited to executing on a single processor at a time, using what is referred to as a "Giant lock" around the kernel.
https://people.freebsd.org/~fsmp/SMP/SMP.html
4.21.2000: Improved support for multiple IO APICs added to 4.0-RELEASE. old messages. Getting started with the FreeBSD SMP kernel. White Papers on FreeBSD SMP: ... The FreeBSD SMP Mail List: You can subscribe to the FreeBSD mail list called 'freebsd-smp' You can search the freebsd-smp …
https://www.freebsd.org/doc/en/books/faq/compatibility-processors.html
FreeBSD supports symmetric multi-processor (SMP) on all non-embedded platforms (e.g, i386, amd64, etc.). SMP is also supported in arm and MIPS kernels, although some CPUs may not support this. FreeBSD's SMP implementation uses fine-grained locking, and performance scales nearly linearly with number of CPUs.
https://www.unix.com/man-page/FreeBSD/4/smp/
FreeBSD 5.0 introduced support for a host of new synchronization primitives, and a move towards fine-grained kernel locking rather than reliance on a Giant kernel lock. The SMPng Project relied heavily on the support of BSDi, who provided reference source code from the fine- grained SMP implementation found in BSD/OS.
https://forums.freebsd.org/threads/does-freebsd-support-interrupt-binding-in-smp-systems.2891/
May 16, 2009 · Linux support the interrupt affinity (interrupt binding) in SMP systems. For example, the NIC interrupt can be redirected by tweaking "/proc/irq/nic_irq_xxx/smp_affinity". Does FreeBSD has similar features? FreeBSD 8 Supports both CPU and IRQ setting:
https://www.freebsd.org/platforms/arm.html
FreeBSD/armv6 supports ARMv6 and ARMv7 processors, including SMP on the latter. Initial support for 64-bit ARM is complete. 64-bit ARM platforms follow a set of standard conventions, and a single FreeBSD build will work on hardware from multiple vendors.
https://www.freebsd.org/releases/11.2R/hardware.html
Symmetric multi-processor (SMP) systems are generally supported by FreeBSD, although in some cases, BIOS or motherboard bugs may generate some problems. Perusal of the archives of the FreeBSD symmetric multiprocessing mailing list may yield some clues.
https://www.freebsd.org/releases/8.0R/relnotes.html
The FreeBSD USB subsystem has been reimplemented to support modern devices and better SMP scalability. The new implementation includes Giant-lock-free device drivers, a Linux compatibility layer, usbconfig (8) utility, full support for split transaction and isochronous transaction, and so on.
https://en.wikipedia.org/wiki/FreeBSD
FreeBSD's kernel provides support for some essential tasks such as managing processes, communication, booting and filesystems. FreeBSD has a monolithic kernel, with a modular design. Different parts of the kernel, such as drivers, are designed as modules. The user can load and unload these modules at any time.OS family: BSD
https://unix.stackexchange.com/questions/12442/openbsd-smp-support
SMP has been supported since OpenBSD 3.6, released in 2004. Presumably the old limit was 4 cores or 16 cores. The easiest way to get SMP support is to install the bsd.mp kernel. That should happen by default if your system has multiple cores.
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