Date: Tue, 03 Jun 2014 21:35:41 -0700 From: Peter Grehan <grehan@freebsd.org> To: Allan Jude <allanjude@freebsd.org> Cc: freebsd-virtualization@freebsd.org Subject: Re: bhyve max virtual CPUs Message-ID: <538EA21D.9060004@freebsd.org> In-Reply-To: <538E66C1.8040804@freebsd.org> References: <20140604001645.GA89475@mouf.net> <538E66C1.8040804@freebsd.org>
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Hi Allan, > I asked about increasing it and was told that it can be done by editing > a value in one of the .h files or something, but the reason it wasn't > higher was that it didn't scale nicely, and they wanted to reword how it > works. > > I would definitely be interested in this, as we run video transcoding > (uses a LOT of cpu) on 24 or 32 core machines, and we'd like to pass > more of the cores into the VM. You can bump it by modifying: sys/amd64/include/vmm.h:#define VM_MAXCPU 16 /* maximum virtual cpus */ ... and rebuilding world+kernel. Let us know how performance goes with larger values. It will probably be a while before this value can be dynamic, but that's the goal. later, Peter.
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