[j-nsp] Juniper's Gigabit performance

[Phil Rosenthal]

On Dec 24, 2003, at 9:10 AM, Josef Buchsteiner wrote:
>
>   There  is  no J-Cell going from the PIC towards the FPC so this
>   is  net.  The  packet  stream  will be cut into Cell at the I/O
>   Manager  towards  Memory  and this is where you have the memory
>   bandwidth of 3.2Gbps excluding J-Cell overhead for one I/O ASIC
>   and  the  reason  why you will not be able to run line rate on
>   4 * 1port GE-PIC on one FPC which is also documented AFAIK.
>
I think there are some big misconceptions people have.  Does this mean 
that if you have 4 gig-e's doing random packet len, 0bps in one 
direction, and 1000mbps in the other, it would max out at an aggregate 
of ~3.2gbps or ~2.5gbps of actual IP data?

--Phil Rosenthal
ISPrime, Inc.