[c-nsp] Full Duplex

[Octavio Alvarez]

On 11/22/2014 12:17 PM, Octavio Alvarez wrote:
> On 11/22/2014 11:43 AM, Mark Tinka wrote:
>> On Saturday, November 22, 2014 02:16:23 AM Octavio Alvarez
>> wrote:
>>
>>> If I found a vendor that did that, I would run away from
>>> it for lying.
>>
>> But they all do that.
>>
>> What is more confusing is when vendors use half-duplex
>> bandwidth to make a line card seem faster, e.g., a 30Gbps
>> line card is sold as a 60Gbps if traffic flows in only one
>> direction.
>
> This is different.
>
> A line card can support 60 Gbps of *processing power* if it can handle a
> full-duplex 30 Gbps interface because it has to process all the data at
> the same time in the worst case. This is correct. And so on: consider a
> two full-duplex 30 Gbps port line card: it would need the necessary
> power to handle 120 Gbps of data if you want it to not block or
> oversubscribe.

Before anything else happens:

I guess I misread your message. I get your point now. The line card 
itself is only 30 Gpbs, but because the traffic is not full-duplex (and 
it will never be) they sell it as a 60 Gbps. Yeah, that sucks too.

Sorry for my confusion and the generated noise.