[ovs-discuss] Hash quality in select group with weighted buckets‏

[ibrahim menem]

Hi all,

I'm testing "weighted select groups" behaviour on ovs2.5 stable, I'm using this command:

ovs-ofctl -O OpenFlow15 add-group ovs0 "group_id=1,type=select,
selection_method=hash,fields(nw_src,nw_dst,tcp_src,tcp_dst),
bucket=bucket_id=1,actions=output:11,weight=$1,
bucket=bucket_id=2,actions=output:12,weight=$2" 

$1 and $2 correspond to the weights column below:

Weights   Measured  Deviation 

50/50      50/50         0
40/60      34/66         6  
30/70      22/78         8 
20/80      13/87         7 
10/90      5.6/94.4      4.4 
50/950     97/3          2 


Traffic pattern (using pktgen_dpdk and only tcp packets):

dst.ip      2.0.0.1  ->  2.255.255.255  
src.ip      1.0.0.1  ->  1.255.255.255
dst.port    1        ->  65000
src.port    1        ->  65000
pkt.size    1500


I
 believed that given enough traffic diversity, weights would be closer 
to the configured ones! I tested against narrower and more realistic 
traffic patterns but still having similar results, any suggestions? 

Thanks,
Ibrahim
 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://openvswitch.org/pipermail/ovs-discuss/attachments/20160830/c16c3afc/attachment-0002.html>