Changes between Version 4 and Version 5 of GENIEducation/ShufengCheatingSheet

Timestamp:

07/03/13 11:54:13 (11 years ago)

Author:

shuang@bbn.com

Comment:

--

GENIEducation/ShufengCheatingSheet

@@ -1 +1 @@
 [[PageOutline]]
 = Hints about using GENI Infrastructure as well as other tools in the GENI system =
+
+== GPO Wiki ==
+ - To find ppl: http://groups.geni.net/syseng/wiki/ContactInfo#CurrentGPOpeople
+ - New Experiment Tutorial Template: http://groups.geni.net/geni/wiki/GENIEducation/SampleAssignments/Template/ExerciseLayout
+ - 
+
+== Traffic Control ==
+ - tc qdisc
+{{{
+tc qdisc add dev eth2 root handle 1:0 netem delay 100ms loss 5%
+tc qdisc add dev eth2 parent 1:0 tbf rate 20mbit buffer 20000 limit 16000
+}}}
+It seems that tc qdisc tbf does not work well (in terms of controlling the throughput of TCP flows) on ovs when ovs switch is connected with a controller. [[BR]]
+Instead, we use ovs-vsctl: 
+{{{
+ovs-vsctl set Interface eth2 ingress_policing_rate=1000
+ovs-vsctl set Interface eth2 ingress_policing_burst=100
+}}}
+The above sets the ingress rate to be in 900kbps-1100kbps. [[BR]]
+To set it back to no rate control, use: 
+{{{
+ovs-vsctl set Interface eth2 ingress_policing_rate=0
+}}}
+
+It is a little bit tricky to configure delay/loss on an OpenVZ virtual machine [[BR]]
+Step 1: find our qdisc family number by executing "sudo /sbin/tc qdisc", a sample output could be like the following: 
+{{{
+[shufeng@center ~]$ sudo /sbin/tc qdisc
+qdisc htb 270: dev mv6.47 root refcnt 2 r2q 10 default 1 direct_packets_stat 0
+qdisc netem 260: dev mv6.47 parent 270:1 limit 1000
+qdisc htb 150: dev mv6.41 root refcnt 2 r2q 10 default 1 direct_packets_stat 0
+qdisc netem 140: dev mv6.41 parent 150:1 limit 1000
+qdisc htb 190: dev mv6.43 root refcnt 2 r2q 10 default 1 direct_packets_stat 0
+qdisc netem 180: dev mv6.43 parent 190:1 limit 1000
+qdisc htb 230: dev mv6.45 root refcnt 2 r2q 10 default 1 direct_packets_stat 0
+qdisc netem 220: dev mv6.45 parent 230:1 limit 1000
+}}}
+Now if the ethernet card you want to change is mv6.43, you can find from following line: 
+{{{
+qdisc htb 190: dev mv6.43 root refcnt 2 r2q 10 default 1 direct_packets_stat 0
+qdisc netem 180: dev mv6.43 parent 190:1 limit 1000
+}}}
+As a result, you change the delay/loss by executing the following: 
+{{{
+sudo /sbin/tc -s qdisc change dev mv6.43 parent 190:1 handle 180: netem limit 1000 delay 100ms loss 5%
+sudo /sbin/tc -s qdisc change dev mv6.43 parent 190:1 handle 180: netem limit 1000
+}}}
 
 == git Commands ==