Date: Tue, 27 Nov 2018 15:20:26 -0700 From: Trent Thompson <trentnthompson@gmail.com> To: Simon Connah <scopensource@gmail.com> Cc: FreeBSD virtualization <freebsd-virtualization@freebsd.org> Subject: Re: Any plans to increase the maximum number of virtual CPUs above 16? Message-ID: <CAE7bWBpBb70BU-sGzZ1R_GwLZfLo=zD3y34M4rD2=5y72=hziw@mail.gmail.com> In-Reply-To: <331a93ae-d4d8-e510-4499-7185e31fbbc9@gmail.com> References: <331a93ae-d4d8-e510-4499-7185e31fbbc9@gmail.com>
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Simon, It is possible to go above that limit if you're willing to recompile the VMM kernel module. There has been some discussion as to why this was set to 16 recently ( https://lists.freebsd.org/pipermail/freebsd-virtualization/2018-November/006939.html ). Some may experience problems at higher counts. I had no issues at 32, and I believe someone else didn't have issues at 24. The line `#define VM_MAXCPU 16 /* maximum virtual cpus */` is what needs to be changed. Reference: https://lists.freebsd.org/pipermail/freebsd-virtualization/2016-September/004721.html On Tue, Nov 27, 2018, 3:07 PM Simon Connah <scopensource@gmail.com wrote: > I was reading the bhyve man page and noticed that it said the maximum > number of virtual CPUs is limited to 16. With AMD Epyc being out with 32 > cores and 64 threads per CPU and being able to have 2 of them in one > system this number seems rather low by modern standards. > > Are there any plans to increase this number to something like 32 virtual > CPUs? > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to " > freebsd-virtualization-unsubscribe@freebsd.org" >
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