Date: Tue, 28 Aug 2018 08:31:32 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: Fabian Freyer <fabian.freyer@physik.tu-berlin.de> Cc: Anish <akgupt3@gmail.com>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: on bhyve statistics Message-ID: <201808281531.w7SFVWfV016212@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <79435a58-9591-b55a-adca-81e037e904ff@physik.tu-berlin.de>
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> On 8/28/18 3:37 PM, Rodney W. Grimes wrote:
> >>>> Currently, bhyve does not expose any of these statistics. All the stats
> >>> available through bhyvectl --get-stats seem to be coming from the VMM,
> >>> not from the userspace emulation.
> >>
> >>> That is correct, byhvectl is a diagnostics tool for getting
> >> information from the kernel/vmm module.
> >>
> >> bhyvectl provide stats related to processor vmx/svm from vmm.ko and is the
> >> first thing you want to run for performance regression. It will be nice to
> >> include it as part of bhyve perf tool/dashboard that you are intended to
> >> build.
> >
> > From conversations with Peter Grehan he expressed that bhyvectl is
> > purely a diagnostics tool that should not be depended on by any
> > other tools.
> >
> > If you want to do similiar things you should program to the libvmmapi
> > interface, not bhyvectl.
>
> For context, this is *not* what I'm aiming to do. While bhyvectl just
> prints statistics exposed by the VMM through libvmmapi, I'm specifically
> asking about instrumenting the userland part, bhyve.
>
> Also, libvmmapi does have downstream consumers that are not
> bhyve{,ctl,load}, e.g. grub2-bhyve, bhyve-multiboot[1], maybe even
> xhyve[2] - for performance reasons, I'd prefer scraping metrics through
> libvmmapi over shelling out to bhyvectl.
Yes, there are other consumers of libvmmapi, why I stressed
that it is the api to interface with vmm.ko.
It might even make since to have the userland bhyve(8)
maintain statistics in libvmmapi for exactly these reasons.
> [1] https://github.com/fubarnetes/bhyve-multiboot
> [2] https://github.com/mist64/xhyve
--
Rod Grimes rgrimes@freebsd.org
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