On time-sync: Every smartphone sold today can have their clocks synced, both in
rate and count value, using GPS that every smartphone has.
So I think the problem of no clock sync is based on the fact that NTP and PTP
are so very, very ancient. And the tooling (iperf and netperf) don't have muc
Also released is python code. It's based on python 3's asyncio. It just
needs password-less ssh to be able to create the pipes. This opens up
the stats processing to a vast majority of tools used by data scientists
at large.
https://sourceforge.net/p/iperf2/code/ci/master/tree/flows/
https://d
A peer likes gnuplot and sed. There are many, many visualization tools.
An excerpt below:
My quick hack one-line parser was based on just a single line from the
iperf output, not the entire log:
[ 1] 0.00-1.00 sec T8-PDF:
bin(w=1ms):cnt(849)=1:583,2:112,3:9,4:8,5:11,6:10,7:7,8:8,9:7,10:2,11
On Mon, Jan 9, 2023 at 12:46 PM rjmcmahon wrote:
>
> The write to read latencies (OWD) are on the server side in CLT form.
> Use --histograms on the server side to enable them.
Thx. It is far more difficult to instrument things on the server side
of the testbed but we will tackle it.
> Your clie
The write to read latencies (OWD) are on the server side in CLT form.
Use --histograms on the server side to enable them.
Your client side sampled TCP RTT is 6ms with less than a 1 ms of
variance (or sqrt of variance as variance is typically squared) No
retries suggest the network isn't dropp
The DC that so graciously loaned us 3 machines for the testbed (thx
equinix!), does support ptp, but we have not configured it yet. In ntp
tests between these hosts we seem to be within 500us, and certainly
50us would be great, in the future.
I note that in all my kvetching about the new tests' ne
My biggest barrier is the lack of clock sync by the devices, i.e. very
limited support for PTP in data centers and in end devices. This limits
the ability to measure one way delays (OWD) and most assume that OWD is
1/2 and RTT which typically is a mistake. We know this intuitively with
airplane
