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20050518:IDD latency ULM->SRCC
- Subject: 20050518:IDD latency ULM->SRCC
- Date: Wed, 18 May 2005 15:59:09 -0600 (MDT)
Hi Adam,
I am seeing a few things going on:
http://my.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?UNIWISC+tornado.geos.ulm.edu
This is odd:
http://my.unidata.ucar.edu/cgi-bin/rtstats/iddstats_nc?IDS|DDPLUS+tornado.geos.ulm.edu
I suspect you have some requests aggregated together, could you please
send in your request lines from your ldmd.conf.
Here it looks as if some sort of "packet shaping" [or something odd] was
occurring up to about 16Z on the 16th...looks pretty good now.
Do you recall any changes to your system around 16Z on the 16th?
Also, your clock is off, you have negative latencies...please implement
NTP.
Are you requesting from stokes as a "PRIMARY" feed or as an "ALTERNATE"
"ALTERNATE" requests utilize a far less efficient protocol..
I would set your clock and I will investigate the situation at LSU, they
have been changing some machines around so am not sure where it is best
for you to feed from currently via LSU...
Ok, it is:
pavan.srcc.lsu.edu
..so lets continue with requesting from LSU via "pavan" as your PRIMARY
feed, and we will look into the WMO feed from OU..which we think may be
the "issue"..
Remember to stop and start your ldm after editing your ldmd.conf file to
make this change.
Cheers,
Jeff
---------------------------------------------------------------------
Jeff Weber address@hidden :
Unidata Program Center PH:303-497-8676 :
University Corp for Atmospheric Research 3300 Mitchell Ln :
http://www.unidata.ucar.edu/staff/jweber Boulder,Co 80307-3000 :
---------------------------------------------------------------------
On Wed, 18 May 2005, Unidata Support wrote:
>
> ------- Forwarded Message
>
> >To: "'Unidata Support'" <address@hidden>
> >From: "Adam Taylor" <address@hidden>
> >Subject: IDD latency
> >Organization: UCAR/Unidata
> >Keywords: 200505182044.j4IKirP3020384
>
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> Here at ULM (tornado.geos.ulm.edu) I have noticed for quite a while that
> were are no longer feeding from seistan.lrcc.lsu.edu. Currently we are
> feeding from stokes.metr.ou.edu which is listed as our backup site in our
> ldmd.conf. Our latency is horrible on all products coming in from them and
> has been for quite some time. I did a ping test for about an hours and got
> a 0% drop rate so I don't think it is the network. Could you guys look into
> it and see what might be going on. I already rebooted tornado and it didn't
> help any.
>
>
>
> Thanks
>
>
>
> Adam Taylor
>
> Computing Center
>
> University of Louisiana at Monroe
>
>
>
>
>
>
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> <p class=3DMsoNormal><font size=3D2 face=3DArial><span =
> style=3D'font-size:10.0pt;
> font-family:Arial'>Here at <st1:City w:st=3D"on"><st1:place =
> w:st=3D"on">ULM</st1:place></st1:City>
> (tornado.geos.ulm.edu) I have noticed for quite a while that were are no =
> longer
> feeding from seistan.lrcc.lsu.edu. Currently we are feeding from
> stokes.metr.ou.edu which is listed as our backup site in our =
> ldmd.conf. Our
> latency is horrible on all products coming in from them and has been for =
> quite
> some time. I did a ping test for about an hours and got a 0% drop =
> rate so I don’t
> think it is the network. Could you guys look into it and see what =
> might be
> going on. I already rebooted tornado and it didn’t help =
> any.<o:p></o:p></span></font></p>
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> <p class=3DMsoNormal><font size=3D2 face=3DArial><span =
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>
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>
> <p class=3DMsoNormal><font size=3D2 face=3DArial><span =
> style=3D'font-size:10.0pt;
> font-family:Arial'>Adam Taylor<o:p></o:p></span></font></p>
>
> <p class=3DMsoNormal><font size=3D2 face=3DArial><span =
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