[c-nsp] Is the 6704 really as terrible as everyone says?

[Charles Spurgeon]

On Thu, Dec 02, 2010 at 09:24:04PM +0000, Nick Hilliard wrote:
> On 02/12/2010 20:00, Charles Spurgeon wrote:
> >We used to think that the newer 6716 card had better buffers until we
> >found this Cisco whitepaper that states that the receive buffer in
> >transparent mode on the 6716 ports is 950KB vs the 2MB buffer on the
> >6704:
> 
> Isn't that the other way around?  I.e. the 6716 has 109Mb input buffers per 
> port in transparent mode and 950k input buffers per port in 
> oversubscription mode.  This is my reading of the URL you posted.

You are correct -- I had a thinko on "transparent."

When the 6716 card is configured for non-oversubscription mode
("transparent" in Cisco-speak) then the receive buffer is 109MB per
port (4 ports active per card).

In oversub mode with all 16 ports active the receive buffer is 950KB,
or less that half the size of the receive buffer on the 6704.

-Charles