On Wed, 31 Jan 2024 17:45:30 -0800
MIchael Miller via discuss <ovs-discuss@openvswitch.org> wrote:
> Hi All,
>
> Not sure if this is the right forum for this question but figured I
> would start here.
>
> Have implemented several dedicated kvm based private virtualization
> server in several Outside Data Center (have no access to
> router/switch configs), Base host is Rocky Linux 9 with OVS 3.2.1
> with dpdk 22.11 complied from source and from that I have created two
> ovs bridges groups, "br-ex" is attached to 10Gbps Server NIC Card and
> vhost-net attached to a KVM running a firewall/router/vpn appliance
> ("WAN" Port), 2nd group is "br-int" which creates a form of a lan
> network without a physical NIC card, this is attached to the KVM
> running the firewall/router/vpn appliance as a "LAN" Port and any KVM
> guest as well via a vhost-net style config. When I test from Base
> Host via speedtest or iperf3, results vary but are typically
> 8+/8+Gbps and same test from KVM guest results in 4/4Gbps which
> sounds great in theory but actually throughput between KVM guests or
> KVM guest and outside world varies, have seen 31Gb take 15 minutes
> and have seen the same 31GB take several hours.
Look at the CPU usage while testing it. Most probably there are
threads scheduled over the same CPU causing the tput to go down.
See this recommendation as an example:
https://access.redhat.com/documentation/pt-br/red_hat_openstack_platform/10/html/ovs-dpdk_end_to_end_troubleshooting_guide/using_virsh_emulatorpin_in_virtual_environments_with_nfv
fbl
>
> Have gone down the rabbit hole of maybe the firewall/router/vpn
> appliance can't handle it but have tried two different vendor
> products: Sonicwall and Mikrotik CHR both have similar results. I
> have also tested a Rocky LInux KVM guest directly attached to the
> "br-ex" group but the results also show degraded performance, which
> is leading me to believe something might have been missed in the OVS
> setup.
>
>
> br-ex/br-int kvm nic config (difference is source bridge line and
> slot= line):
>
> <interface type="bridge">
> <mac address="<removed>"/>
> <source bridge="br-ex"/>
> <virtualport type="openvswitch">
> <parameters interfaceid="<removed>"/>
> </virtualport>
> <target dev="vnet0"/>
> <model type="virtio"/>
> <driver name="vhost" txmode="iothread" ioeventfd="on"
> event_idx="off" queues="8"/>
> <alias name="net0"/>
> <address type="pci" domain="0x0000" bus="0x00" slot="0x08"
> function="0x0"/>
> </interface>
>
>
--
fbl
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