To observe CPU usage by driver by processor, use intrstat.
Here are some intrstat result obtained with
intrstat -c 8,11,12 4
n denotes the number of running vms on the node, bw is the bandwidth
measured with
iperf -c <vm-address> -t 30
The values for the mpt#0 device are not constant across the four seconds
sampling intervals.
n = 1, bw = 900+ Mbps
device | cpu8 %tim cpu11 %tim cpu12 %tim
-------------+---------------------------------------------
e1000g#0 | 0 0.0 3 0.0 0 0.0
e1000g#1 | 0 0.0 0 0.0 15020 35.9
ehci#0 | 0 0.0 0 0.0 0 0.0
ehci#1 | 0 0.0 0 0.0 0 0.0
mpt#0 | 0 0.0 0 0.0 0 0.0
n = 8, bw = 848 Mbps
device | cpu8 %tim cpu11 %tim cpu12 %tim
-------------+---------------------------------------------
e1000g#0 | 0 0.0 1 0.0 0 0.0
e1000g#1 | 0 0.0 0 0.0 8522 88.7
ehci#0 | 0 0.0 0 0.0 0 0.0
ehci#1 | 0 0.0 0 0.0 0 0.0
mpt#0 | 91 0.1 0 0.0 0 0.0
n = 16, bw = 166 Mbps:
device | cpu8 %tim cpu11 %tim cpu12 %tim
-------------+---------------------------------------------
e1000g#0 | 0 0.0 3 0.0 0 0.0
e1000g#1 | 0 0.0 0 0.0 109 76.7
ehci#0 | 0 0.0 0 0.0 0 0.0
ehci#1 | 0 0.0 0 0.0 0 0.0
mpt#0 | 81 0.1 0 0.0 0 0.0
n = 24, bw = 81 Mbps:
device | cpu8 %tim cpu11 %tim cpu12 %tim
-------------+---------------------------------------------
e1000g#0 | 0 0.0 1 0.0 0 0.0
e1000g#1 | 0 0.0 0 0.0 54 84.8
ehci#0 | 0 0.0 0 0.0 0 0.0
ehci#1 | 0 0.0 0 0.0 0 0.0
mpt#0 | 74 0.1 0 0.0 0 0.0
n = 32, bw = 67 Mbps:
device | cpu8 %tim cpu11 %tim cpu12 %tim
-------------+---------------------------------------------
e1000g#0 | 0 0.0 4 0.0 0 0.0
e1000g#1 | 0 0.0 0 0.0 46 89.5
ehci#0 | 0 0.0 0 0.0 0 0.0
ehci#1 | 0 0.0 0 0.0 0 0.0
mpt#0 | 1862 1.6 0 0.0 0 0.0
n = 36, bw = 54 Mbps:
device | cpu8 %tim cpu11 %tim cpu12 %tim
-------------+---------------------------------------------
e1000g#0 | 0 0.0 37 0.1 0 0.0
e1000g#1 | 0 0.0 0 0.0 36 89.3
ehci#0 | 0 0.0 0 0.0 0 0.0
ehci#1 | 0 0.0 0 0.0 0 0.0
mpt#0 | 134 0.1 0 0.0 0 0.0
Kind Regards,
Stefan
-------------------------------------------
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