[j-nsp] EX Routing Throughput

[Richard A Steenbergen]

On Sun, Nov 08, 2009 at 04:47:35PM +0200, Eugeniu Patrascu wrote:
> Maybe a bit late, but this is the most I saw on an EX4200 on 10GE
> ports under test.
...
>   Input rate    ?: 7618850816 bps (14880568 pps)
>   Output rate   ?: 7618851328 bps (14880569 pps)

Good, that is line rate (or at least really, really close). See this 
post about Ethernet overhead:

http://www.mail-archive.com/juniper-nsp@puck.nether.net/msg06957.html

The one thing Foundry did right (well ok, it might be more than one
thing, but not much more :P) was include a "percent of utilization"
value in show interface which takes layer 1/2 overhead into account. For
example:

  30 second input rate: 167851488 bits/sec, 42024 packets/sec, 17.45% utilization
  30 second output rate: 142724024 bits/sec, 26461 packets/sec, 14.69% utilization

In your example above, it would say 100.00%. This is the kind of thing 
other vendors could greatly benefit from.

Of course there are other problems with Juniper architecture and 
calculating layer 2 overhead. EX is actually "correct" in this regard, 
while other Juniper platforms are incorrect because they don't measure 
layer 2 overhead in the counters. More details here:

http://www.mail-archive.com/juniper-nsp@puck.nether.net/msg06119.html

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)