[OmniOS-discuss] illumos-kvm network performance

[Tobias Oetiker]

Today Tobias Oetiker wrote:

> Hi
>
> I have been looking into network performance on omnios hosted kvm
> hosts. especially in connection with ssh.
>
> the test is this:
>
>   physical-linux-host$ ssh -c aes256-cbc virtual-kvm-linux-host dd if=/dev/zero bs=10M count=10 > /dev/null
>
> running this simple test from a physical ubuntu 12.04 host to a
> omnios hosted (virtio) ubuntu 12.04 I get ~ 9 MB/s
>
> running the same test to a ubuntu 12.04 running on linux kvm host
> I get ~ 69 MB/s
>
> runnint the test between two physical linux hosts I get well over 100 MB/s
>
> any hints on how to improve the performance on kvm on omnios ? Or
> am I the only one seeing this ?

upon further investigtion I found that smartos seem to be launching their
kvm instances with

  -device virtio-net-pci,mac=$mac,tx=timer,x-txtimer=200000,x-txburst=128,vlan=0

using this I got up to 30.5 MB/s (still not the 69 MB/s seen with
linux, but at least somewhat closer) ...

cheers
tobi


> cheers
> tobi
>
> ps all these systems support the hw aes and running this test via
> localhost returns transfer speeds over 100 MB/s on all of them
>
>

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