Date: Thu, 15 Feb 2018 16:46:11 +1030 From: Shane Ambler <FreeBSD@ShaneWare.Biz> To: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> Cc: tech-lists <tech-lists@zyxst.net>, freebsd-virtualization@freebsd.org Subject: Re: bhyve and contention Message-ID: <6fc388d9-388f-1cd3-ee8b-16d8e9204447@ShaneWare.Biz> In-Reply-To: <201802141910.w1EJAMQi054510@pdx.rh.CN85.dnsmgr.net> References: <201802141910.w1EJAMQi054510@pdx.rh.CN85.dnsmgr.net>
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On 15/02/2018 05:40, Rodney W. Grimes wrote: > [ Charset UTF-8 unsupported, converting... ] >> On 14/02/2018 10:18, Peter Grehan wrote: >> Be sure not to pass the -S option to bhyve as it wires the guest memory. >> This was seen recently as sysutils/chyves uses it by default. > > This should be evaluated, if you do not pass -S you run into the > possible performance impact of swapping guest memory, which does > infact allow you more over commit, but at a pretty large > performance penality. The original question specified having 5 guests with 8G each on a host with 32G, so overcommitting ram was expected, wiring each guest in this setup will cause panics not swapping. > You need swap space if you are going to not pass -S and over commit, > if you do not have enough swap space for the over commit your system > runs out of swap and usually ends up killing random processes, and > random usually means the most important things you are running! The host has 64G swap setup. -- FreeBSD - the place to B...Software Developing Shane Ambler
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