Date: Wed, 12 Nov 2014 16:55:18 -0500 From: Allan Jude <allanjude@freebsd.org> To: freebsd-virtualization@freebsd.org Subject: Re: How hard is BHyVe's 16 vCPU limit, is it configurable under any circumstance? Message-ID: <5463D746.4030803@freebsd.org> In-Reply-To: <8e39523570b667d223091adc3791c9e2@openmailbox.org> References: <8e39523570b667d223091adc3791c9e2@openmailbox.org>
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[-- Attachment #1 --] On 2014-11-12 16:39, tinkr@openmailbox.org wrote: > Hi! > > In order justify giving energy to BHyVe, I need to know if it's > "future-proof" in that the 16 vCPU limit can be increased? > > Please let the world know if BHyVe's 16 vCPU limit can be lifted in some > way, by configuration, patch, etc. (and if you want to, why this limit > is in place by default today). > > Thanks!! > Tinker > > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to > "freebsd-virtualization-unsubscribe@freebsd.org" You can increase the limit by editing sys/amd64/include/vmm.h #define VM_MAXCPU 16 From what I've been told, things scale badly above 24 CPUs. They plan to solve this issue, but have not yet. If you system has enough cores to support using more than 16 per VM, you can modify the file and recompile the kernel and use as many CPUs as you want, but not much testing has happened with bigger numbers. -- Allan Jude [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (MingW32) iQIcBAEBAgAGBQJUY9dIAAoJEJrBFpNRJZKfs/EP/2nHN5D6amqE5CtfI/PAdK8s mJmBHII4socC5F7eyHfjue1grb8kW9MaJR0/9v1hAcAFvtGo/8qK3junc0/BGc8V +3uMG2wQ4k1E4XDCvjk/J82DpGKDZVdd3A/lLKYixhuN+QDRnGyrmACbgnXCMDt/ lsd2VaPScZ8Hql5WrTAmNJceyGyb53I0M3AboAEPMFb3kQR8iW3dym8qDYKmijzJ sBbBrNwNNTwDLqxdeBj01AtTDpdhtQOf4QReDtZ2u2fXnpRsBDSlL4si+6/c+Gl3 CvPYy2/dP8GBoOvNGT6a3nlGyWFluwtnKBzGz4EyRsdclXvkEETvASi8cgQ2kvwU h+pGIKhT5vV9IXPYyIxuocaTZh3y3HhK3Bs1NDQoBGafjQDc6cP8VJOdZEXUxTLU D/k2ofQv9r+brP8laabFuiqHCVrUtH4r5YQct1qh8aYR+ZUA6+tHCQCdwL2iYF3R ZgGCowZD3kd5LE3mZREtRLfLlrzjoB/ytyrlGQkRXCcUj18KtYw+6ZEVR0xccos0 TPDws9nIOf5DfcZYOiOm128qNeOIDPlFoHckW1VB1yRRpi1ENBUM/eEvhsHJSLFR AkV3/agE913Nb/z5z9o5X489WADY1OJBnHlSZNzEs7rZjF91yTIIP0kaRrPI9fXm d+rRYq0YKMqiexQ/p2Ac =p3qT -----END PGP SIGNATURE-----help
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