Poor NIC performance in Proxmox 2.3

[Warwick Chapman]

Howdy

Strange issue at Hetzner.

I have 3 servers with them. 2 perform at 100M both ways (EQ4 and EQ8) and this third and newest one (SB74) is 100M both ways when booted on the Debian-based Hetzner rescue system and 100M in and 30-35M out when booted into Proxmox 2.3 (installed from ISO).

lspci (booted into Proxmox):
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)



dmesg (booted into Proxmox):
r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
r8169 0000:06:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
r8169 0000:06:00.0: setting latency timer to 64
alloc irq_desc for 26 on node -1
alloc kstat_irqs on node -1
r8169 0000:06:00.0: irq 26 for MSI/MSI-X
r8169 0000:06:00.0: eth0: RTL8168c/8111c at 0xffffc9000306c000, 6c:62:6d:a0:77:76, XID 1c4000c0 IRQ 26
r8169 0000:06:00.0: eth0: jumbo features [frames: 6128 bytes, tx checksumming: ko]



I have performed this test booted in rescue mode and it seems to be 100M both ways:


[FONT=courier new, monospace]root@rescue ~ # iperf -c open.da.org.za
[FONT=courier new, monospace]------------------------------------------------------------[/FONT]
[FONT=courier new, monospace]Client connecting to open.da.org.za, TCP port 5001[/FONT]
[FONT=courier new, monospace]TCP window size: 21.9 KByte (default)[/FONT]
[FONT=courier new, monospace]------------------------------------------------------------[/FONT]
[FONT=courier new, monospace][ 3] local 46.4.171.228 port 49948 connected with 78.46.63.11 port 5001[/FONT]
[FONT=courier new, monospace][ ID] Interval Transfer Bandwidth[/FONT]
[FONT=courier new, monospace][ 3] 0.0-10.1 sec 114 MBytes 94.8 Mbits/sec[/FONT]
[FONT=courier new, monospace]
[/FONT]
root@rescue ~ # iperf -s

[FONT=courier new, monospace]------------------------------------------------------------[/FONT]
[FONT=courier new, monospace]Server listening on TCP port 5001[/FONT]
[FONT=courier new, monospace]TCP window size: 85.3 KByte (default)[/FONT]
[FONT=courier new, monospace]------------------------------------------------------------[/FONT]
[FONT=courier new, monospace][ 4] local 46.4.171.228 port 5001 connected with 78.46.63.11 port 58805[/FONT]
[FONT=courier new, monospace][ ID] Interval Transfer Bandwidth[/FONT]
[FONT=courier new, monospace][ 4] 0.0-10.2 sec 114 MBytes 93.4 Mbits/sec[/FONT]



[/FONT]
When I am booted into Proxmox download seems to be 100M and upload 30-35M:


[FONT=courier new, monospace]root@open-02:~# iperf -c open
[FONT=courier new, monospace]------------------------------------------------------------[/FONT]
[FONT=courier new, monospace]Client connecting to open, TCP port 5001[/FONT]
[FONT=courier new, monospace]TCP window size: 23.8 KByte (default)[/FONT]
[FONT=courier new, monospace]------------------------------------------------------------[/FONT]
[FONT=courier new, monospace][ 3] local 46.4.171.228 port 42206 connected with 78.46.63.11 port 5001[/FONT]
[FONT=courier new, monospace][ ID] Interval Transfer Bandwidth[/FONT]
[FONT=courier new, monospace][ 3] 0.0-10.0 sec 110 MBytes 92.2 Mbits/sec[/FONT]
[FONT=courier new, monospace]
[/FONT]
[FONT=courier new, monospace]root@open-02:~# iperf -s[/FONT]
[FONT=courier new, monospace]------------------------------------------------------------[/FONT]
[FONT=courier new, monospace]Server listening on TCP port 5001[/FONT]
[FONT=courier new, monospace]TCP window size: 85.3 KByte (default)[/FONT]
[FONT=courier new, monospace]------------------------------------------------------------[/FONT]
[FONT=courier new, monospace][ 4] local 46.4.171.228 port 5001 connected with 78.46.63.11 port 58817[/FONT]
[FONT=courier new, monospace][ ID] Interval Transfer Bandwidth[/FONT]
[FONT=courier new, monospace][ 4] 0.0-10.0 sec 42.1 MBytes 35.3 Mbits/sec[/FONT]
[FONT=courier new, monospace]
[/FONT]
[/FONT]
Any advice?