Re: [conduit] Large CONDUIT latencies to UW-Madison idd.aos.wisc.edu starting the last day or two.

Pete,

We've been struggling with latencies for months to the point where I've been feeding gfs 0p25 from NCEP and the rest from Unidata... that is, up untl Feb 10th. The afternoon of the 10th, our latencies to NCEP dropped to what I consider "normal", an average maximum latency of about 30 seconds. Our networking folks and NCEP have been trying to identify what this problem was, but as far as I know, no problem has been identified or action taken. So, it appears it's all buried in the mysteries of the internet. I've switched data collection back to NCEP at this point, but I'm on the edge of my seat waiting to see if it reverts back to the old behavior...

Art

From: "Pete Pokrandt" <address@hidden>
To: "Carissa Klemmer - NOAA Federal" <address@hidden>, "Arthur A Person" <address@hidden>, "_NCEP.List.pmb-dataflow" <address@hidden>
Cc: "address@hidden" <address@hidden>, "Michael Schmidt" <address@hidden>, "Bentley, Alicia M" <address@hidden>, "Daes Support" <address@hidden>
Sent: Friday, February 19, 2016 12:20:20 PM
Subject: Large CONDUIT latencies to UW-Madison idd.aos.wisc.edu starting the last day or two.

All,

Not sure if this is on my end or somewhere upstream, but the last several runs my CONDUIT latencies have been getting huge to the point where we are losing data.

I did stop my ldm the other day to add in an alternate feed for Gilbert at allisonhous.com, not sure if that pushed me over a bandwidth limit, or by reconnecting we got hooked up to a different remote ldm, or taking a different path, that shot the latencies up.

Seems to be really only CONDUIT, none of our other feeds show this kind of latency.

Still looking into things locally, but wanted make people aware. I just rebooted idd.aos.wisc.edu, will see if that helps at all.

Here's an ldmping and traceroute from idd.aos.wisc.edu to conduit.ncep.noaa.gov.

[ldm@idd ~]$ ldmping conduit.ncep.noaa.gov

Feb 19 17:16:08 INFO: State Elapsed Port Remote_Host rpc_stat

Feb 19 17:16:08 INFO: Resolving conduit.ncep.noaa.gov to 140.90.101.42 took 0.00486 seconds

Feb 19 17:16:08 INFO: RESPONDING 0.115499 388 conduit.ncep.noaa.gov

traceroute to conduit.ncep.noaa.gov (140.90.101.42), 30 hops max, 60 byte packets

1 r-cssc-b280c-1-core-vlan-510-primary.net.wisc.edu (144.92.130.3) 0.760 ms 0.954 ms 0.991 ms

2 internet2-ord-600w-100G.net.wisc.edu (144.92.254.229) 18.119 ms 18.123 ms 18.107 ms

3 et-10-0-0.107.rtr.clev.net.internet2.edu (198.71.45.9) 27.836 ms 27.852 ms 27.838 ms

4 et-11-3-0-1276.clpk-core.maxgigapop.net (206.196.177.4) 37.363 ms 37.363 ms 37.345 ms

5 noaa-i2.demarc.maxgigapop.net (206.196.177.118) 38.051 ms 38.254 ms 38.401 ms

6 140.90.111.36 (140.90.111.36) 118.042 ms 118.412 ms 118.529 ms

7 140.90.76.69 (140.90.76.69) 41.764 ms 40.343 ms 40.500 ms

8 * * *

9 * * *

10 * * *

Similarly to ncepldm

[ldm@idd ~]$ ldmping ncepldm4.woc.noaa.gov

Feb 19 17:18:40 INFO: State Elapsed Port Remote_Host rpc_stat

Feb 19 17:18:40 INFO: Resolving ncepldm4.woc.noaa.gov to 140.172.17.205 took 0.001599 seconds

Feb 19 17:18:40 INFO: RESPONDING 0.088901 388 ncepldm4.woc.noaa.gov

^C

[ldm@idd ~]$ traceroute ncepldm4.woc.noaa.gov

traceroute to ncepldm4.woc.noaa.gov (140.172.17.205), 30 hops max, 60 byte packets

1 r-cssc-b280c-1-core-vlan-510-primary.net.wisc.edu (144.92.130.3) 0.730 ms 0.831 ms 0.876 ms

2 internet2-ord-600w-100G.net.wisc.edu (144.92.254.229) 18.092 ms 18.092 ms 18.080 ms

3 ae0.3454.core-l3.frgp.net (192.43.217.223) 40.196 ms 40.226 ms 40.256 ms

4 noaa-i2.frgp.net (128.117.243.11) 40.970 ms 41.012 ms 40.996 ms

5 2001-mlx8-eth-1-2.boulder.noaa.gov (140.172.2.18) 42.780 ms 42.778 ms 42.764 ms

6 mdf-rtr-6.boulder.noaa.gov (140.172.6.251) 40.869 ms 40.922 ms 40.946 ms

7 * * *

8 * * *

Pete

--
Pete Pokrandt - Systems Programmer
UW-Madison Dept of Atmospheric and Oceanic Sciences
608-262-3086 - address@hidden

Arthur A. Person
Research Assistant, System Administrator
Penn State Department of Meteorology
email: address@hidden, phone: 814-863-1563