Date: Tue, 6 Nov 2018 16:03:17 -0800 (PST) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: tech-lists <tech-lists@zyxst.net> Cc: freebsd-virtualization@freebsd.org Subject: Re: is there a vCPU hard limit for bhyve guests? Message-ID: <201811070003.wA703H1Q098310@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <20181106172535.20e46ef6@desktop.local>
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> Hi, > > On a host with hw.ncpu=48 I tried to start a bhyve guest with -c 24 and > it failed to start. So I tried -c 16 and it starts and runs as > expected. Any more than -c 16 fails to run. > > Is a maximum of 16 vCPU hardwired somewhere, and if so, why? Is there a > way to overcome the limit? man bhyve Look at -c option, default is 1 max is 16. There is a compile time constant VM_MAXCPU, you can raise that to 20, then other problems come about that require more patching. Last time I played with this it failed above 16, I suspect some other places have had a bad derived constant using the assumption that 16 is the max. > thanks, > -- > J. > _______________________________________________ > 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" > -- Rod Grimes rgrimes@freebsd.org
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