Date: Tue, 3 Sep 2013 15:24:18 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: hackers@freebsd.org, Dmitry Sivachenko <trtrmitya@gmail.com> Subject: Re: About CPU cores numbering an processor affinity Message-ID: <201309031524.18162.jhb@freebsd.org> In-Reply-To: <1D21F5BC-63CD-4B33-9286-6687E62FDB15@gmail.com> References: <1D21F5BC-63CD-4B33-9286-6687E62FDB15@gmail.com>
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On Friday, August 23, 2013 9:23:51 am Dmitry Sivachenko wrote: > Hello! > > I am using FreeBSD-9-STABLE on the following hardware: > > FreeBSD/SMP: Multiprocessor System Detected: 24 CPUs > FreeBSD/SMP: 2 package(s) x 6 core(s) x 2 SMT threads > > So I have 2 physical CPUs with 6 core each. > > # cpuset -g > pid -1 mask: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 > > > So each of 24 cores are numbered 0..23. > > 1) In what particular order are these cores numbered? Can I assume that 0..11 correspond to 1st physical CPU and 12..23 to second? How SMT threads are numbered within each core? Yes, the numbering is "grouped" so that you have each package as a contiguous block. Each core is a contiguous block as well, so SMT threads are adjacent to each other. > Should I use "-x" option of cpuset for that purpose (to bind irq 260 and 261 in my example)? Yes, cpuset -x. -- John Baldwin
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