Date: Sat, 15 Feb 2025 19:40:57 +0400 From: Antranig Vartanian <antranigv@freebsd.am> To: FreeBSD Louisville <freebsdlouisville@gmail.com> Cc: freebsd-virtualization@freebsd.org Subject: Re: Can I allocate some CPUs to the bhyve host? Message-ID: <13C5B773-5437-4087-9A88-AFD6C4A0F021@freebsd.am> In-Reply-To: <978106d8-1ad0-4227-a387-aa4bece0b156@Gmail.com> References: <978106d8-1ad0-4227-a387-aa4bece0b156@Gmail.com>
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[-- Attachment #1 --] I think you can. bhyve has an option named -p which maps the vcpu to the host cpu. In our cluster we have the following in vm-bhyve’s config file: bhyve_options="-p 0:28 -p 100:156 -p 1:29 -p 101:157 -p 2:30 -p 102:158 -p 3:31 -p 103:159 -p 4:32 -p 104:160 -p 5:33 -p 105:161 -p 6:34 -p 106:162 […] 197:253 -p 98:126 -p 198:254 -p 99:127 -p 199:255” Now, to be fair I am matching a single vCPU to a host CPU (and then using the cpuset subsystem to “Detach” that cpu from the host), but I don’t see a reason why you would not be able to match multiple vCPUs to a single host CPU. (someone correct me if I'm wrong). Hope this helps. — Antranig Vartanian https://antranigv.am/ PGP Key ID: 0x2D59F21C > On 15 Feb 2025, at 7:34 PM, FreeBSD Louisville <freebsdlouisville@gmail.com> wrote: > > It appears to me that a user could over-provision CPUs to guests, causing massive slowdown of the system. Can I specify CPUs to be "locked" to the host? If I have 16 processors available, could I start guests that want 32 CPUs? > > [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEElMZjj3yN+bx0tQ6G3jmYZi1Z8hwFAmewtYkACgkQ3jmYZi1Z 8hwq0g//QYFTeLKUw/55dEerGi3fQn6U85v1stL8hrDsTd6jVGL2W/j5j9mjyK6A LlZLyEM+JRUdF6Fu3mjIYiww7fTKIbVQ1ZF6UgW/mp9pzLn+eEDpqso/nw1X/j62 IAWhF75mtFsql2+Vj2b7/DxofJXZHP2O1/CMdxdsF5vBuG8QPD6YNNAQdlHlBBxI Z7Yjrra0uMmBvxKaEhdtfiF6W1U0GvxUwvN0zhNYu2xloq9T4mJ0ugdkiqjQS7Kk 4SKDYLAHYAs3Yd7uM071w7iLSuOoyOqiK8E0z9GXiBzen2cCo6AEdsfUiNCaiEhD M+rpXTtGiKqtAEdzCZbd3QNgblcdVY8XfS7JVIJRlMFs+O+16d7oUM5d8NbjXaHM YEAkxl2R/ggmVog/Gs94+tOtL82434N9fmWyVQwvwmrhlqZA7qQg60MCabYNsv7R rziOolp67/uVtfxKHSddPr/oZmGsD20UKtpKvmsEeR+NpMbpvgvi/DSJD4EamM3B O+Tr1nlz5fRgX+iOxPOXH32a2gGHkixNzdWC9O+A1/voRZDnauJS3dpRmKWhcKDm zQhJ7hUkaX/XTNGYjz39t6DuygeFfZbBCwc9Q+R3FOvaL3cDXIha4J+5hnKTONMn ow9P+XrDP5XQ7pgFM2veUIx5/nrZXVzcAyUEY6XRyamx3kwUW10= =izf9 -----END PGP SIGNATURE-----help
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