Date: Tue, 22 Mar 2016 17:13:05 -0700 From: John Baldwin <jhb@freebsd.org> To: arch@freebsd.org Subject: More fine-grained NUMA knobs Message-ID: <27035442.YCnG4SQ1mX@ralph.baldwin.cx>
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Some of the I/O device affinity stuff such as bus_get_domain() (and the bus_get_cpus() I have in review in D5519) are useful on their own right even if the VM system is not doing NUMA-aware allocations. I think it would be useful to be able to enable these two "prongs" of NUMA awareness independently. To that end, I have a little strawman patch that adds two new kernel options: VM_NUMA_ALLOC and DEVICE_NUMA. I actually think it is probably worth enabling DEVICE_NUMA by default on x86 (and bumping the default MAXMEMDOM to, say, 8 (quad-socket haswell)). You can see the simple patch at: https://github.com/bsdjhb/freebsd/compare/master...bsdjhb:numa_opts Thoughts? -- John Baldwin
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