Gigabit Ethernet performance with Realtek 8111E

[Michael Laß]

Hi!

Sorry for my late response.

Am Montag, den 07.11.2011, 09:59 -0800 schrieb YongHyeon PYUN:
> > 
> > Some revisions of RealTek controller have FIFO overrun issue but
> > I'm not sure whether you're seeing the issue.  Try enabling flow
> > control and see whether that makes any difference. You can enable
> > it by issuing 'ifconfig re0 media flow'.
> 
> This should be read as 'ifconfig re0 mediaopt flow'.

It may be that enabling flow control helps a bit but it definately does
not solve the problem. There are still hundreds of packets missed in
just one or two minutes. Maybe there is no difference at all.

> > Show me the dmesg output. RealTek uses the same device PCI ids so it's
> > impossible to know which controller you have from the pciconf(8)
> > output.

I think the relevant part is this one:
> re0: <RealTek 8168/8111 B/C/CP/D/DP/E PCIe Gigabit Ethernet> port 0x1000-0x10ff mem 0xf0004000-0xf0004fff,0xf0000000-0xf0003fff irq 16 at device 0.0 on pci1
> re0: Using 1 MSI-X message
> re0: Chip rev. 0x2c000000
> re0: MAC rev. 0x00000000
> miibus0: <MII bus> on re0
> rgephy0: <RTL8169S/8110S/8211 1000BASE-T media interface> PHY 1 on miibus0
> rgephy0:  none, 10baseT, 10baseT-FDX, 10baseT-FDX-flow, 100baseTX, 100baseTX-FDX, 100baseTX-FDX-flow, 1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, 1000baseT-FDX-flow, 1000baseT-FDX-flow-master, auto, auto-flow
> re0: Ethernet address: 38:60:77:3e:af:a5

Full dmesg output is also attached.

Greetings,
Michael

PS: In my first mail I wrote that I can reproduce the problem only with
one of two connected hosts. I think the reason is that the other host
only produces a maximum of 250Mbit/s while the problematic transfers go
up to 550Mbit/s.