[j-nsp] policer useless

[MPuras@solunet.com]

Hi Markus,


   I think the problem that Blaz is seeing has to do with the windows =
size
and the burst-size being used.  I ran into this problem before and if I
recall recorrectly, I was using a small burst burst-size close to the =
MTU
which I think was 1500 which gave me poor results.  Noticing the window =
size
being requested from the PC, what was occuring was that it was allowing =
the
traffic to burst and then it would drop it.  It would then renegotiate =
the
window size and would have to retransmit a lot of traffic over again.  =
This
cause the performance to be very poor.  My solution was to increase the
burst-size to atleast 10x the MTU to get the results that I was looking =
for,
otherwise, I would see the same issues Blaz is seeing.  My 2 cents.


Thanks,

Mario Puras
SoluNet Technical Support=20



-----Original Message-----
From: Markus =C5berg (LMF) [mailto:Markus.Aberg@lmf.ericsson.se]
Sent: Thursday, September 12, 2002 10:48 AM
To: juniper-nsp@puck.nether.net
Subject: RE: [j-nsp] policer useless


I connected a Smartbits(R) with 2 fastethernet cards to a M10 with a
fastethernet PIC.

Blasting 100Mbit/s small (64 byte) *raw IP* packets thru the box i get
pretty accurate results.=20

smartbits -> fe-1/0/0.0 <-> fe-1/0/3.0 <- smartbits

With no policing 100% thruput (obviously)

bandwidth-limit 8m+burst 100k	7995400 bps
bandwidth-limit 2m/100k		1983448 bps
bandwidth-limit 4m/100k		3997240 bps
bandwidth-limit 256k/2k		244040 bps

This is using 1 static source/destination IP address on each smartbits =
port
(10.5.5.5 and 10.6.6.6) routed thru the box (directly connected =
networks)

--
Markus =C5berg
Oy LM Ericsson Ab
E-mail: markus.aberg@ericsson.com
=20


-----Original Message-----
From: Blaz Zupan [mailto:blaz@inlimbo.org]
Sent: 11. syyskuuta 2002 21:56
To: Rubens Kuhl Jr.
Cc: juniper-nsp@puck.nether.net
Subject: Re: [j-nsp] policer useless


> Try multiplying the rate you want by 1.25; I don't recall the exact
number,
> but this is approximately the factor between bytes on the line and =
bytes
> required to transport them on J-cells thru the shared memory.

Actually I tried setting the policer to 8m, the result was a transfer =
rate
of
390 kbytes/s. I find no logic in this...

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