[j-nsp] M10 maximum throughput

[Rubens Kuhl Jr.]

A good description of the process is found at
http://juniper.cluepon.net/index.php/J-cell

But I disagree with the wiki text on
http://juniper.cluepon.net/index.php/FPC_Bandwidth that states 3.2
Gbps as a realistic worst case, because not all packets will have
sizes that are multiple of 64 bytes, which is the only case that would
achieve the 3.2 Gbps maximum.
This reference (http://www.nlanr.net/NA/Learn/Gm/pktsizes.html) states
that 40 byte packets account for 40% of the packets flowing around; 40
byte packets require 16 byte paddings for each J-Cell, so if all other
packets would be 64 byte multiples, performance would already been
limited to 2.72 Gbps.

I agree that 2.5 Gbps is a safe bet here.

Rubens


On 12/31/05, Jeff S Wheeler <jsw at inconcepts.biz> wrote:
> On Fri, 2005-12-30 at 10:56 -0700, Stacy W. Smith wrote:
> > In addition, the M10's maximimum throughput can be more precisely
> > described as 3.2Gbps full-duplex per FPC (horizontal row of PICs).
>
> Note also that 3.2Gbps figure is valid under ideal conditions.  2.5Gbps
> is a real-world figure that most folks seem comfortable with.
>
> -- J
>
>
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