[c-nsp] 10GE card for 7609

[Lee]

On 3/31/09, Richard A Steenbergen <ras at e-gerbil.net> wrote:
> On Tue, Mar 31, 2009 at 10:01:24AM +0200, Gergely Antal wrote:
>
>> I meant that you can not push 40G out of a 6704
>> even with a dfc attached to it.But you can do it with a 6708
>> with 1:1 subscription.
>
> Worse, some days you can't even get 7G in from a single port on a 6704
> with the other 3 ports unused. We routinely have problems with ingress
> interface overruns or egress interface output queue overflows on 6704
> in that traffic range, and DFC doesn't make any difference.
>
> It seems like it is head of line blocking, and TAC's only answer is
> "those things have no buffers, buy a 6708".

We had a TAC case for input queue drops on a 6704 port - they told us
it's a hardware limitation.  When traffic is switched between two
ports leading to the same asic you're limited to about 8Gb per port.

Regards,
Lee