KVM High LoadAverage Understanding

christian.arminio

Hello,

I installed pfsense on a kvm/ubuntu_server_14.04 machine, with intel celeron 2 core and 4GB RAM.
I have allocated 2 CPU and 2GB RAM to the 'virtual pfsense firewall'.
I also checked this 2 box on pfsense web_gui :

Hardware TCP Segmentation Offloading
Hardware Large Receive Offloading

And on the kvm/ubuntu_server_14.04 machine this from command line :


#That's is 4 find the virtual interface used by pfsense
for vm in $(virsh list | grep running | awk '{print $2}'); do echo -n "$vm:"; virsh dumpxml $vm| grep -oP "vnet\d+" ; done
#That's the Output
PfSenseFireWall:vnet1
vnet2
#That's the command used 4 turn off tx offloading 
sudo ethtool -K vnet1 tx off
sudo ethtool -K vnet2 tx off

I add this in rc.local :

# Turn tx OffLoading @ Boot
sudo ethtool -K vnet1 tx off
sudo ethtool -K vnet2 tx off

I've installed this package on pfsense :

freeradius2
iperf
ntopng

I set 3 interface :

em0 wan
em1 lan
ovpnc1 vpn_client

On LAN I've enabled a Captive Portal with a custom page (login..error..ecc..) and I autenticate users using freeradius.
No shaper is enabled . In the future I'll add some other wan with VLAN on the actual wan interface.
But now I need to understand this command line 's output :

top -aSH
 PID USERNAME   PRI NICE   SIZE    RES STATE   C   TIME    WCPU COMMAND
   11 root       155 ki31     0K    32K CPU0    0  59:24  97.75% [idle{idle: cp
   11 root       155 ki31     0K    32K RUN     1  59:45  96.97% [idle{idle: cp
51557 root        20    0   158M 37280K nanslp  1   0:46   2.88% /usr/local/bin
    4 root       -16    -     0K    32K -       0   0:42   0.98% [cam{doneq0}]
   12 root       -60    -     0K   288K WAIT    1   0:21   0.20% [intr{swi4: cl
   12 root       -88    -     0K   288K WAIT    1   0:21   0.20% [intr{irq15: a
    0 root       -92    -     0K   192K -       0   0:07   0.10% [kernel{dummyn
   20 root        16    -     0K    16K syncer  1   0:04   0.10% [syncer]
    0 root       -16    -     0K   192K swapin  1   0:38   0.00% [kernel{swappe
   12 root       -88    -     0K   288K WAIT    1   0:14   0.00% [intr{irq14: a
   12 root       -56    -     0K   288K WAIT    1   0:12   0.00% [intr{swi5: fa
50894 root        20    0 24028K  4268K kqread  1   0:07   0.00% redis-server:
  310 root        42    0   278M 54536K select  0   0:04   0.00% /usr/local/bin
51557 root        20    0   158M 37280K nanslp  1   0:04   0.00% /usr/local/bin
   12 root       -92    -     0K   288K WAIT    1   0:02   0.00% [intr{irq11: r
   14 root        -8    -     0K    48K -       1   0:02   0.00% [geom{g_down}]
   18 root        20    -     0K    32K sdflus  1   0:02   0.00% [bufdaemon{/ w[/code]
[code]5:09PM  up  1:31, 1 user, load averages: 1.33, 1.43, 1.49[/code]
Who's idle ? Is this process using 97.75% of CPU ?
[code]   11 root       155 ki31     0K    32K CPU0    0  59:24  97.75% [idle{idle: cp
   11 root       155 ki31     0K    32K RUN     1  59:45  96.97% [idle{idle: cp[/code]
There is a way to reduce the load average ?
[code]1 user, load averages: 1.33, 1.43, 1.49[/code]
I try to install kvm using virt type = qemu and in a second test using virt type = kvm
But with the same results .

Can someone write what are the performance using more wan tagged with VLAN using switch and interface 1000GB and if I can have problem using kvm ?

Thx in advance 4 any reply.
Best regards
Christian Arminio 

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