Mail Bridge Performance


Phill Gross (gross@mitre.ARPA)
Mon, 3 Mar 86 08:26:47 est


BAD MSG:
most of the summer before dropping in August (hard working summer-hires
uitting to head for the beaches?) The rest of the year looks like taget
practice except for lows at Labor day, Thanksgiving, Christmas and
New Years.

At first I thought this was a standard holiday trend but
then noticed that several of these turned out to be problems in data
collection (presumably either gateways or the monitoring hosts were
down). This may have even more sinister implications - when BBN goes
home for the holidays, the network falls apart. (And here I thought
robustness was one of the fundamental requirements.)

The highest traffic was the second week of the new year (schools back
in session, time to catch up on sf-lovers?) The most recent 5-6 weeks show
an upswing, which, if continued, means a traffic increase of 33% over the
last year.

The data for the mail bridges seems flatter than for the system as a
whole. Except for significant bumps in Mar-Apr and mid-summer, the traffic
hovered between 25-27 Million packets per week through September.
There does seem to be the same pseudo-holiday effect toward the end
of the year and the data also reflects the upswing over the last 5-6
weeks (but without the bump in the second week of Jan).

          Traffic Sent by LSI Gateways (1/28/85 - 2/17/86)
120 | (in Million pkts)
     | .
110 | .
     | .
100 | . . . .
     | . . . . .
 90 | . .. .. .. . . ..
     | ... ... .. .
 80 | . . . . .
     |. .. . . . . *
 70 | . * . .
     | * *
<60 | * *
     +---------------------------------------------------------
      JF M A M J J A S O N D J F
                  (* denotes incomplete data)

          Traffic Sent by Mail Bridges (1/28/85 - 2/17/86)
 40 | (in Million pkts)
     |
     |
     | . . . ..
 30 | ... . . . . .
     | . . .. . . .. . .. ..
     |. .. . . .. ... ... .. . .
     | . . . .
 20 | * * **
     | *
<15 | *
     +---------------------------------------------------------
      JF M A M J J A S O N D J F
                  (* denotes incomplete data)

So if things seem to have gotten worse lately, it's because there has
been a real increase in traffic. Perhaps the recent traffic numbers
(30-33M pkts for mail bridges and 100-105M for the whole system) represent
a new Peter Principle corollary - the system has been utilized past it's
level of competence. Anyone know the installation schedule for the
Butterflys?

Has anyone out there wasted the disk space to save the gateway throughput
reports over the last few years? If so, get in touch. I'd be interested
to get a longer baseline. Since my programs can't read paper, I'd
prefer online copies (but I'll take what I can get).

Phill Gross



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