non patched kernel perf stat
─
[ 3] local 10.13.0.4 port 36554 connected with 104.40.129.48 port 8042
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-377.9 sec 100 MBytes 0.26 MBytes/sec
Performance counter stats for 'iperf -c 104.40.129.48 -f M -p 8042 -n
100M':
452.813718 task-clock (msec) # 0.001 CPUs utilized
38287 context-switches # 0.085 M/sec
11 cpu-migrations # 0.024
K/sec
151 page-faults # 0.333
K/sec
0 cycles #
0.000 GHz
0 stalled-cycles-frontend # 0.00%
frontend cycles idle
0 stalled-cycles-backend # 0.00% backend
cycles idle
0 instructions
0 branches #
0.000 K/sec
0 branch-misses # 0.000
K/sec
377.932572800 seconds time elapsed
######################################################
patched kernel perf stat
[ 3] local 10.23.0.4 port 45723 connected with 40.115.34.62 port 8042
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 0.9 sec 100 MBytes 106 MBytes/sec
Performance counter stats for 'iperf -c 40.115.34.62 -f M -p 8042 -n
100M':
30.442426 task-clock (msec) # 0.031 CPUs
utilized
206 context-switches # 0.007 M/sec
3 cpu-migrations # 0.099
K/sec
154 page-faults # 0.005
M/sec
0 cycles #
0.000 GHz
0 stalled-cycles-frontend # 0.00% frontend
cycles idle
0 stalled-cycles-backend # 0.00% backend
cycles idle
0 instructions
0 branches #
0.000 K/sec
0 branch-misses # 0.000
K/sec
0.997563300 seconds time elapsed
######################################################
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1521053
Title:
Network Performance dropping between vms on different location in
Azure
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Vivid:
In Progress
Bug description:
[Impact]
Ubuntu VMs between different location in Azure , especially North Europe and
East Europe in this case, have network performance issue.
It should be around 100MB/s speed between them. but it's around 0.3MB/s when
dropping happens.
[Fix]
Upstream development
0d158852a8089099a6959ae235b20f230871982f ("hv_netvsc: Clean up two unused
variables")
It's affected over 3.19.0-28-generic (ubuntu-vivid)
[Testcase]
Make 2 VMs on North Europe, West Europe each.
Then run below test script
NE VM
- netcat & nload
while true; do netcat -l 8080 < /dev/zero; done;
nload -u M eth0 ( need nload pkg )
- iperf
iperf -s -f M
WE VM
- netcat
for i in {1..1000}
do
timeout 30s nc NE_HOST 8080 > /dev/null
done
- iperf
iperf -c HOST -f M
Network performance dropping can be seen frequently.
More Tests
http://pastebin.ubuntu.com/13657083/
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1521053/+subscriptions
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