Date: Wed, 1 Dec 2021 21:13:48 +0300 From: Oleg Ginzburg <olevole@olevole.ru> To: Miroslav Lachman <000.fbsd@quip.cz>, rgrimes@freebsd.org Cc: bsdlists@jld3.net, jbo@insane.engineer, freebsd-virtualization@freebsd.org Subject: Re: bhyve vCPU limit Message-ID: <CAMsb%2BmbY4ZbtFvBHd15naGT-BdXAVKg6BAOTpnBNg7hNcg2Czw@mail.gmail.com> In-Reply-To: <30e4454c-414a-833f-3829-586a450e7205@quip.cz> References: <PigdsByvTXmOLg46mIkWprP1GQQPuxEiHn55uKNYuSBIzBFFe-CVGYdJ2FuzYSd5OebhMlSpRGMIisaN07yzjSSaWz8JQ7LeXDeINIZg_D8=@insane.engineer> <4E8A7FD3-B01E-4ADE-A290-360F3B04AC0F@jld3.net> <30e4454c-414a-833f-3829-586a450e7205@quip.cz>
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Hi On Wed, Dec 1, 2021 at 7:52 PM Miroslav Lachman <000.fbsd@quip.cz> wrote: >I was playing with VMs in VirtualBox and Bhyve and compared > performance with increasing vCPU count. The more cores VM get the slower How many physical cores you have on the host? This is a characteristic behavior when overcoming. But without overcommit I observe productivity growth: 1) Single vCore benchmark via cpuminer: https://pastebin.com/mg46RvDT TOP from host: https://pastebin.com/LvbBiyFz 2) Sixteen vCore benchmark via cpuminer: https://pastebin.com/7FQjaVM8 TOP from host: https://pastebin.com/dLpreq9D I observe almost linear growth. In addition, the loss of performance can be associated with NUMA (required cpuset/cpuset_setaffinity and control of memory capacity) As far as I remember, it is not enough to simply change one parameter in .h file: https://bhyvecon.org/bhyveconOttawa2019-Rodney.pdf
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