[OmniOS-discuss] kvm performance regresseion r10 -> r12

[Tobias Oetiker]

I am still running omnios r10 ...being reluctant to upgrade,
because we find that kvm virtio network performance seems to have
taken a severe hit from r10 to r12

I am runing this simple test:

  hw-box$ ssh -c aes256-ctr kvm-guest dd if=/dev/zero bs=10M count=10 > /dev/null

On r10 I get 31 MB/s

On r12 I get 21 MB/s


On both systems we are running kvm with the magic

  -device-virtio-net-pci,mac=$mac,tx=timer,x-txtimer=200000,x-txburst=128,vlan=0
  -net vnic,vlan=0,name=net0,ifname=$VNIC,macaddr=$mac


Questions

a) do you see that too ?

b) any ideas what could be causing it ?

kvm-guest is configured with 8 CPUs and 16 GB ram

cheers
tobi



-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
www.oetiker.ch tobi at oetiker.ch +41 62 775 9902