[Beowulf] bonding and bandwidth

[Douglas Eadline, Cluster World Magazine]

Been a while since I played with the bonding stuff, but do you still 
need two separate fabrics (either two switches or a segmented switch)?

If you need two fabrics, then using one switch will limit your speed to one
NIC (at least that was my experience several years ago)

Doug

On Mon, 7 Jun 2004, Jean-Marc Larré wrote:

> Hi all,
> 
> I'm testing bonding.c with two gigabit ethernet links toward a HP 2848 
> switch. My kernel is 2.4.24 from kernel.org on RedHat 9.0
> modules.conf is like this :
> [root at node01 root]# cat /etc/modules.conf
> alias eth1 bcm5700
> alias eth2 bcm5700
> alias bond0 bonding
> options bond0 miimon=100 mode=balance-alb updelay=50000
> 
> My problem :
> I get a bandwidth around 900Mbit/s and not 1800Mbit/s with netperf or 
> iperf or NetPipe. Could you explain me why I'm not get 1800Mbit/s and 
> where is my problem ?
> 
> Thank you
> Sincerely.
> Jean-Marc
> 

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