At 12:53 PM 1/13/2005, cisc...@puck.nether.net averred:
Message: 1
Date: Thu, 13 Jan 2005 18:12:20 +0100 (CET)
From: Mikael Abrahamsson <swm...@swm.pp.se>
Subject: Re: [c-nsp] Cisco 6509 and Bus speeds
To: cisc...@puck.nether.net
Message-ID: <Pine...@uplift.swm.pp.se>
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Thu, 13 Jan 2005, Tim Stevenson wrote:
This card is not fully non-blocking, but it is nearly (like >98%) line
rate on all 4 ports with large packets. You can't ever get full 40G wire
ethernet across the fabric, as we add 32 bytes of overhead to every
packet. Also, the fwding engine is the bottleneck at 64B packets, ie,
either the sup (30Mpps) or a DFC3 (48Mpps) has less capacity than 4x10G
ports (60Mpps).
But in the case of i-mix (avg 300 byte packets) it's able to do at least
90% of all ports?
Yes.
Is there any combination of ports that are bundled
together asic-wise or channelwise on the 6704, or are all ports equal in
respect to each other?
Yes, ports 1-2 share one 20G channel to the fabric, and ports 3-4 share the
other.
For full non-blocking 10G on 2 ports, you use one port from each channel.
Tim
19 messages in net.nether.puck.cisco-nsp[c-nsp] Cisco 6509 and Bus speeds
