[ntp:questions] Asymmetric Delay and NTP

Joe Gwinn joegwinn at comcast.net
Thu Mar 20 00:14:27 UTC 2014

In article <lgcoq8$b4j$1 at dont-email.me>, E-Mail Sent to this address
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<Null at BlackList.Anitech-Systems.invalid> wrote:

> Joe Gwinn wrote:>  What greatly helps is to have a LAN for the heavy
> >   applications traffic, and a different LAN for NTP
> >   and the like, forcing different paths in the OS
> >   kernel to be taken.
> If you see a difference, I would have though it more likely
>  to be different usage of the IP stacks than anything
>  significantly different happening in the kernel?

Yes, the protocol stacks are where in the kernel that the problem most
likely happens.

> If NTP is important enough, create a NTP VLAN set to a higher
>  priority than all other traffic, to isolate NTP traffic
>  from the effects of other network traffic?

I'm not so sure that the kernel implements such priorities all the way
through.  We opted for two physically distinct LANs, each with their
own NIC card, plugged into different processors of the enterprise
server class machine that needed the time.

Joe Gwinn

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