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Re: [Ntp] virtual server for ntp server

Warner Losh <imp@bsdimp.com> Tue, 26 March 2024 17:44 UTC

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From: Warner Losh <imp@bsdimp.com>
Date: Tue, 26 Mar 2024 18:44:41 +0100
Message-ID: <CANCZdfoE98b7WQdA0V-g4kqWsfnUv9cU2wznHeQDMqsLyjiRfQ@mail.gmail.com>
To: "Salz, Rich" <rsalz=40akamai.com@dmarc.ietf.org>
Cc: Renzo Marengo <buckroger2011@gmail.com>, NTP WG <ntp@ietf.org>
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Subject: Re: [Ntp] virtual server for ntp server
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On Tue, Mar 26, 2024, 6:21 PM Salz, Rich <rsalz=40akamai.com@dmarc.ietf.org>
wrote:

> I'm not able to find official document which suggests to not implement ntp
> server using virtual machine; I'd like to know reasons but specially what
> RFC shows this recommendation.
>
>
>
> This is not mentioned in any RFC.
>

As for why: increased jitter with VMs due to software emulationof time
keeping and networking devices and uncertainty around scheduling the target
software. Though maybe not all VMs, since there are much better hardware /
software combos than when this bit of wisdom was created.

My home ntp server runs in a bhyve VM and/or a FreeBSD bare metal depending
on what hardware I have lying around.

Warner

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