nanog mailing list archives
Re: 400G forwarding - how does it work?
From: James Bensley <jwbensley+nanog () gmail com>
Date: Wed, 27 Jul 2022 21:50:29 +0200
On Tue, 26 Jul 2022 at 21:39, Lawrence Wobker <ljwobker () gmail com> wrote:
So if this pipeline can do 1.25 billion PPS and I want to be able to forward 10BPPS, I can build a chip that has 8 of these pipelines and get my performance target that way. I could also build a "pipeline" that processes multiple packets per clock, if I have one that does 2 packets/clock then I only need 4 of said pipelines... and so on and so forth.
Thanks for the response Lawrence. The Broadcom BCM16K KBP has a clock speed of 1.2Ghz, so I expect the J2 to have something similar (as someone already mentioned, most chips I've seen are in the 1-1.5Ghz range), so in this case "only" 2 pipelines would be needed to maintain the headline 2Bpps rate of the J2, or even just 1 if they have managed to squeeze out two packets per cycle through parallelisation within the pipeline. Cheers, James.
Current thread:
- Re: 400G forwarding - how does it work?, (continued)
- Re: 400G forwarding - how does it work? James Bensley (Jul 25)
- Re: 400G forwarding - how does it work? Saku Ytti (Jul 25)
- RE: 400G forwarding - how does it work? Vasilenko Eduard via NANOG (Jul 26)
- Re: 400G forwarding - how does it work? Saku Ytti (Jul 26)
- RE: 400G forwarding - how does it work? Vasilenko Eduard via NANOG (Jul 26)
- Re: 400G forwarding - how does it work? Etienne-Victor Depasquale via NANOG (Jul 26)
- RE: 400G forwarding - how does it work? Vasilenko Eduard via NANOG (Jul 26)
- Re: 400G forwarding - how does it work? James Bensley (Jul 25)
- Re: 400G forwarding - how does it work? jwbensley+nanog (Jul 26)
- Re: 400G forwarding - how does it work? Lawrence Wobker (Jul 26)
- Re: 400G forwarding - how does it work? dip (Jul 26)
- Re: 400G forwarding - how does it work? James Bensley (Jul 27)
- Re: 400G forwarding - how does it work? Saku Ytti (Jul 26)
- Re: 400G forwarding - how does it work? Tom Beecher (Jul 25)
- Re: 400G forwarding - how does it work? James Bensley (Jul 25)
- Re: 400G forwarding - how does it work? Lincoln Dale (Jul 25)
- Re: 400G forwarding - how does it work? Jeff Tantsura (Jul 26)
- Re: 400G forwarding - how does it work? Saku Ytti (Jul 26)
- Re: 400G forwarding - how does it work? Jeff Tantsura (Jul 27)