Open Stack

Hi,

This is normal because OVS or LinuxBridge wire up VMs using TAP interface
which runs on kernel space and that drives higher interrupt and that makes
the kernel so busy working on handling packets. Standard OVS/LinuxBridge
are not meant for higher PPS.

If you want to handle higher PPS then look for DPDK or SRIOV deployment. (
We are running everything in SRIOV because of high PPS requirement)

On Tue, Sep 5, 2023 at 11:11 AM Ha Noi <hanoi952022 at gmail.com> wrote:

> Hi everyone,
>
> I'm using Openstack Train and Openvswitch for ML2 driver and GRE for
> tunnel type. I tested our network performance between two VMs and suffer
> packet loss as below.
>
> VM1: IP: 10.20.1.206
>
> VM2: IP: 10.20.1.154 <https://10.20.1.154/24>
>
> VM3: IP: 10.20.1.72
>
>
> Using iperf3 to testing performance between VM1 and VM2.
>
> Run iperf3 client and server on both VMs.
>
> On VM2: iperf3 -t 10000 -b 130M -l 442 -P 6 -u -c 10.20.1.206
>
> On VM1: iperf3 -t 10000 -b 130M -l 442 -P 6 -u -c 10.20.1.154
> <https://10.20.1.154/24>
>
>
> Using VM3 ping into VM1, then the packet is lost and the latency is quite
> high.
>
>
> ping -i 0.1 10.20.1.206
>
> PING 10.20.1.206 (10.20.1.206) 56(84) bytes of data.
>
> 64 bytes from 10.20.1.206: icmp_seq=1 ttl=64 time=7.70 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=2 ttl=64 time=6.90 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=3 ttl=64 time=7.71 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=4 ttl=64 time=7.98 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=6 ttl=64 time=8.58 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=7 ttl=64 time=8.34 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=8 ttl=64 time=8.09 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=10 ttl=64 time=4.57 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=11 ttl=64 time=8.74 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=12 ttl=64 time=9.37 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=14 ttl=64 time=9.59 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=15 ttl=64 time=7.97 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=16 ttl=64 time=8.72 ms
>
> 64 bytes from 10.20.1.206: icmp_seq=17 ttl=64 time=9.23 ms
>
> ^C
>
> --- 10.20.1.206 ping statistics ---
>
> 34 packets transmitted, 28 received, 17.6471% packet loss, time 3328ms
>
> rtt min/avg/max/mdev = 1.396/6.266/9.590/2.805 ms
>
>
>
> Does any one get this issue ?
>
> Please help me. Thanks
>
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