[c-nsp] 10GE card for 7609

[Richard A Steenbergen]

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". The problem can usually be
worked around by changing the way traffic is being mapped between the
ports. For example, the one that seems to be the absolute worst case is
"in one port and out the other on the same fabric channel", i.e. in port
1 and out port 2 or the same thing on 3/4.

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
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