CLS to CLS Latency info

Saku Ytti saku at
Tue Oct 30 09:28:36 UTC 2018

Agreed. Actual ping would not work, if we're talking about unixy
system sending ping. Active devices increase latency in single digit
microsecond, the host latency is much much higher, so the ping results
would largely measure your host latency variation. You'd need NIC with
hardware timestamping to get anything useful. I don't think we have
unixy 'ping' tool which uses that? Even though typical server NIC
today does do that, unfortunately SR-IOV does not expose it to guests,
so guests would need direct NIC access to utilise it.

On Tue, 30 Oct 2018 at 10:03, Ben Cannon <ben at> wrote:
> I’d be astonished if they varied much from lightspeed.
> -Ben
> On Oct 29, 2018, at 8:11 PM, Mehmet Akcin <mehmet at> wrote:
> Hello there
> I have been searching for CLS (Cable Landing Station) to CLS latency infirnation for submarine cables. I was able to identify only a handful of them via sales catalogs. I am still missing like 320~ systems, does wnyone have this info available?
> If i can’t find the data, i am going to formulate from lentgh of fiber diveded by speed of light on fibre (~ +\- resistance) but I really would prefer actual ping ;)
> This is for project. Thank you in advance!
> Mehmet
> --
> Mehmet
> +1-424-298-1903


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