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11-11-2014 04:13 PM
11-11-2014 04:13 PM
HP3500yl- flows slow each other down when ports are disjoint
Hi,
The problem we are getting is when we have 4 machines connected to port number 1,2,3,4 of hp 3500yl switch,
we found traffic from port 1 to port 2, and port 3 to port 4 will conflict with each other. When these traffic are sent simultaneously, they only get half of the bandwidth(around 30Mbit/s) compared with the full bandwidth when are sent individually(64Mbits/s). Since the ports are disjoint, we think there is a problem there. It seems the flows are sharing a big queue inside the switch. The output of show-tech-all is attached. I would like to know if it is normal for 3500yl switch, or there is some configuration problem there? Thank you!
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11-11-2014 06:11 PM
11-11-2014 06:11 PM
Re: HP3500yl- flows slow each other down when ports are disjoint
HP-Switch2# show openflow instance vlan2
Configured OF Version : 1.3
Negotiated OF Version : 1.0
Instance Name : vlan2
Admin. Status : Enabled
Member List : VLAN 2
Listen Port : 6633
Oper. Status : Up
Oper. Status Reason : NA
Datapath ID : 00022c27d7787280
Mode : Active
Flow Location : Hardware and Software
No. of Hw Flows : 0
No. of Sw Flows : 26
Hw. Rate Limit : 10000000 kbps
Sw. Rate Limit : 10000 pps
Conn. Interrupt Mode : Fail-Secure
Maximum Backoff Interval : 1 seconds
Probe Interval : 10 seconds
Hw. Table Miss Count : NA
No. of Sw Flow Tables : 1
Egress Only Ports : None
Table Model : Single Table
Controller Id Connection Status Connection State Secure Role
------------- ----------------- ---------------- ------ ------
1 Connected Active No Equal
2 Disconnected Backoff No Equal
You can see we have 26 software flows and 0 hardware flows. The limit for software flows is 10000 packet/s, which means the entire openflow instance vlan2(port 1 to port 12), can only send 10000 packets/s. This is the maximum limit one can set for openflow instance. So we might need to find a way to process flows in hardware.
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11-14-2014 01:57 AM - edited 11-14-2014 02:04 AM
11-14-2014 01:57 AM - edited 11-14-2014 02:04 AM
Re: HP3500yl- flows slow each other down when ports are disjoint
Hi chrisxcai
Hi
You are right the fact is software flows will not give you close to line rate.
There is a finite number of software resources. I have also noticed you are using OpenFlow 1.0(Negotiated) it might be a good idea to try to get to OF 1.3. The flow tables on the switch will help you identify hardware and software flows easier and well the capibilities of each is list in the software version your using's OpenFLow Administration guide.
You should be able to find the appropriate guide at the following URL ( Yeah it is a very long URL)
Just look at the document name and for example
HP OpenFlow 1.3 Administrator Guide Wired Switches K/KA/KB/WB 15.16
THis document is for the 15.16 software brances and covers switches that runs K.15.16.xxxx and KA.15.16.xxxx and KB.15.16.xxxx and WB.15.16.xxxx
Kind Regards
Gerhard
HP SDN Team