Subject: Re: the maximal speed of pktgen with 1Gbps NIC

From: Stephen Hemminger <[email-masked]>
Date: Wed, 22 Jul 2009 10:25:20 -0700

On Wed, 22 Jul 2009 17:12:32 +0200
Ben Hutchings <[email-masked]> wrote:

> On Wed, 2009-07-22 at 14:56 +0200, Jesper Dangaard Brouer wrote:
> > On Wed, 22 Jul 2009, [email-masked] wrote:
> > 
> > > anyone knows the maximal speed of pktgen with 1Gbps NIC?
> > 
> > You are limited by the number of packets per second (pps) your machine can 
> > generate.  This limitation is given by the CPU speed and the NIC used.
> > 
> > The maximum pps I have seen with pktgen at 1Gbit/s is 1200 kpps.
> > 
> > 1Gbit/s wire speed pps with 64 bytes packets is approx 1953 kpps.
> > (1000*10^6/(64*8) = 1953125)
> [...]
> 
> You need to take the inter-packet gap into consideration too.
> 
> Ben.

Speed	Packets/sec	TCP MByte/sec
 10 M	    14880.95	     1,170,351
100 M	   148809.52	    11,703,511
  1 G	  1488095.24	   123,755,256
 10 G	 14880952.38	 1,237,552,556
 40 G	 59523809.52	 4,950,210,224
100 G	148809523.81	12,375,525,559

* TCP assumes timestamp option and jumbo frames if possible.

http://www.erg.abdn.ac.uk/users/gorry/course/lan-pages/enet-calc.html
--