[SOLVED] Network issue - Slow performance on vmbr0

[grefabu]

Hi,

we reconise a slow performance off some our VMs, the speed between is only 10Mbit/s
No I test iperf between the pve nodes and I see, it is the Nodes vmbt0 / eno1 with the poor performance.

iperf -c:

Client connecting to 10.0.1.41, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 10.0.1.4 port 34646 connected with 10.0.1.41 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   113 MBytes  94.6 Mbits/sec

It is an broadcom BCM5719:

root@ph-pve004:~# lspci -s 02:00.0 -v
02:00.0 Ethernet controller: Broadcom Limited NetXtreme BCM5719 Gigabit Ethernet PCIe (rev 01)
        Subsystem: Hewlett-Packard Company Ethernet 1Gb 4-port 331i Adapter
        Flags: bus master, fast devsel, latency 0, IRQ 16, NUMA node 0
        Memory at 95190000 (64-bit, prefetchable) [size=64K]
        Memory at 951a0000 (64-bit, prefetchable) [size=64K]
        Memory at 951b0000 (64-bit, prefetchable) [size=64K]
        [virtual] Expansion ROM at 92b00000 [disabled] [size=256K]
        Capabilities: [48] Power Management version 3
        Capabilities: [50] Vital Product Data
        Capabilities: [58] MSI: Enable- Count=1/8 Maskable- 64bit+
        Capabilities: [a0] MSI-X: Enable+ Count=17 Masked-
        Capabilities: [ac] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [13c] Device Serial Number 00-00-94-57-a5-5a-e6-9c
        Capabilities: [150] Power Budgeting <?>
        Capabilities: [160] Virtual Channel
        Kernel driver in use: tg3
        Kernel modules: tg3

ip l:

2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UP mode DEFAULT group default qlen 1000
    link/ether 94:57:a5:5a:e6:9c brd ff:ff:ff:ff:ff:ff
12: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 94:57:a5:5a:e6:9c brd ff:ff:ff:ff:ff:ff

I can't see why it only work with 100MBit instead of 1GBit. I am sure since when it is so. But now after I see the problem I want to clear it.

The next thing is to look to the switch, but any idea?

Bye

Gregor

 

[Moayad]

Hi,

how looks the VM config like? and the network configuration?

 

[grefabu]

It seem a switch problem. I change the Port and now I've a GBit again.

 

[Moayad]

Thank you for sharing your solution

Have a nice day.