Date: Sun, 7 May 2023 23:51:34 +0200 From: Moin Rahman <bofh@freebsd.org> To: Ed Maste <emaste@freebsd.org> Cc: freebsd-arch <freebsd-arch@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Support for more than 256 CPU cores Message-ID: <E6E2D507-A9F0-4199-8501-3D9B901C5831@freebsd.org> In-Reply-To: <CAPyFy2DODJVhs5o8xddaj7GD8zZfC3g1zm_guWKeCmeE07wn-w@mail.gmail.com> References: <CAPyFy2DODJVhs5o8xddaj7GD8zZfC3g1zm_guWKeCmeE07wn-w@mail.gmail.com>
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[-- Attachment #1 --] > On May 5, 2023, at 3:38 PM, Ed Maste <emaste@freebsd.org> wrote: > > FreeBSD supports up to 256 CPU cores in the default kernel configuration > (on Tier-1 architectures). Systems with more than 256 cores are > available now, and will become increasingly common over FreeBSD 14’s > lifetime. The FreeBSD Foundation is supporting the effort to increase > MAXCPU, and PR269572[1] is open to track tasks and changes. > > As a project we have scalability work ahead of us to make best use of > high core count machines, but at a minimum we should be able to boot a > GENERIC kernel on such systems, and have an ABI for the FreeBSD 14 > release that supports such a configuration. > > Some changes have already been committed in support of increased MAXCPU, > including increasing MAX_APIC_ID (commit c8113dad7ed4) and a number of > changes to reduce bloat (such as commits 42f722e721cd, e72f7ed43eef, > 78cfa762ebf2 and 74ac712f72cf). > > The next step is to increase the maximum cpuset size for userland. > I have this change open in review D39941[2] and an exp-run request in > PR271213[3]. Following that the kernel change for increasing MAXCPU is > in D36838[4]. > > Additional work on bloat reduction will continue after this change, and > looking forward FreeBSD is going to need ongoing effort from the > community and the FreeBSD Foundation to continue improving scalability. > > [1] https://bugs.freebsd.org/269572 > [2] https://reviews.freebsd.org/D39941 > [3] https://bugs.freebsd.org/271213 > [4] https://reviews.freebsd.org/D36838 > By any chance will this be merged into 13? Kind regards, Moin [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEETfdREoUGjQZKBS+fvbm1phfAvJEFAmRYHWZfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDRE Rjc1MTEyODUwNjhEMDY0QTA1MkY5RkJEQjlCNUE2MTdDMEJDOTEACgkQvbm1phfA vJHjIw/+PJmVaqSnjEOT6WJiuZvO72HKqpZIlH4GlDeZR9aWrCOVPiw7MjnYvoZa E0XPBngzxPnM5adP0k7rjekdIScwxkorqZsNa6ncTGXc7sa1dDe22wjVPlTk3BxX eLy+SjzoNcilT8bcykFbl2OydFwTR4AhtGWFn1oZ/KvqZXeYrfH+TmsxswleKe8D pDgmalvUTD736ugYeG08+amdEv6leT1RaOuUdADxWTj7ptU7aJSZhwHyZthpsq7d 6y2JxDIhxi2trmK3TaOfPf5yXHUdt9d6/sV3Z/gD7e8nSKBnI8ZZ/dGHk7/PLpsh AxqImzwPi1jldTxcE/LPXJ4wyEWF1FVGCIhyBJhASdn0HkjpuWKCjFVHYDmbEaRU LNZ0iJnNGHTiMfOxLpp/SsushQQYNkAdcQWlZVSJ31JgYSV/kx0XvgU/A96Cikjx 6To+Rxp6xB1Hn5IjC4RMaUcaZy0qbBsywmWVNDGeIfCDCLIg306sABRtY0Q1HmBR mTH4K0bmGlj6FgRuQXewquSNnytuLCELh8rUErNuK1UM2obHyYKlehFyYRifJZwh IOj2izQFj+6krGjpepP/5yHRRgQ2iwBchCqFr6QoJZYKt1c80kqUrUWKGSYyojq7 JghRa61zEptePqlnHO/9heudUFkBVght3DS8+LsTqi9Su7Kwlqg= =0Pdu -----END PGP SIGNATURE-----help
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