[j-nsp] New 16port 10G Card and new MPC with 4x10G MIC Cards - coexistance of old DPCs and new Cards in same chassis -- looking for experience feedback

[Richard A Steenbergen]

On Sun, Aug 29, 2010 at 11:00:55AM +0400, Pavel Lunin wrote:
> 
> > * The Trio PFE is good for around 55Mpps of lookups, give or take,
> >  depending on the exact operations being performed.
> 
> 55, not 65? Anyway, this is what I can't understand (maybe because of 
> my not-native English). When you say 'give or take', you mean it can 
> only do 55/65 for both directions or 55/65 for ethernet->backplane and 
> 55/65 backwards?

55 million PACKETS/sec of lookups per PFE, no directionality to that. 
Lookups are done at ingress. And 55 is what I'm told, not 65.

> If this is an LU overall limit for both direction than either I can't 
> manage to convert pps to bps (65pps is about 30 Gigs for 64-byte 
> packets, isn't it) or everything has is twice less performance than we 
> think (not likely though).

Bandwidth is a completely different limitation, which comes from the MQ 
and/or fabric limits. Technically 4 ports of 10GE would exceed the 
55Mpps, 14.488Mpps * 4 = 57.952Mpps, so you wouldn't quite be able to 
get line rate on small packets even with local switching.

-- 
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)