[evla-sw-discuss] alerts - reliable delivery

[Ken Sowinski]

> From evla-sw-discuss-bounces at donar.cv.nrao.edu  Mon Mar 14 13:08:18 2005
> Return-Path: <evla-sw-discuss-bounces at donar.cv.nrao.edu>
> Date: Mon, 14 Mar 2005 13:07:51 -0700 (MST)
> From: Barry Clark <bclark at aoc.nrao.edu>
> To: evla-sw-discuss at nrao.edu
> Subject: Re: [evla-sw-discuss] alerts - reliable delivery

> I'm disturbed that we do see missing alert packets.  This is a few orders
> of magnitude greater loss than we were questimating on the basis of no
> data, and, if the number of missing packets grows as the square of the
> data rates, as theory suggests it should, when we complete the EVLA
> conversion, we will have 50 times the traffic and 2500 times the missing
> alert packets.  Sounds like we might be in trouble.


When we discussed this last week I offered a minority opinion
that we had no real evidence of missed packets yet.  Rather we
don't really yet understand what we are seeing.  The system is 
far from steady state, things come and go at random times, and
we don't have an accurate idea of the execution history of 
subsystems like the MIBs, checker or flagger.

Still flagging needs to be as reliable as we can manage.

Ken