netdev - Re: r8169 performance?

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Date:	Sun, 4 Dec 2011 18:46:50 -0600
From:	Chris Adams <cmadams@...aay.net>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org, hayeswang <hayeswang@...ltek.com>
Subject: Re: r8169 performance?

Once upon a time, Francois Romieu <romieu@...zoreil.com> said:
> Chris Adams <cmadams@...aay.net> :
> [...]
> > Are there any suggestions for what I might be able to do to improve
> > throughput?  Is there a driver issue, or is it in how the motherboard
> > implemented the NIC ?
> 
> Can you grep for the r8169 lines in the dmesg of both computers and
> send the XID lines ?
> 
> It should show if the nics are the same or not.

On the "problem" computer (on Fedora 16, kernel 3.1.2):

[    7.101106] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[    7.102665] r8169 0000:02:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[    7.107308] r8169 0000:02:00.0: setting latency timer to 64
[    7.107370] r8169 0000:02:00.0: irq 42 for MSI/MSI-X
[    7.107703] r8169 0000:02:00.0: eth0: RTL8168d/8111d at 0xffffc900112fc000, 00:19:66:f2:dc:0b, XID 081000c0 IRQ 42

On the "okay" computer (on Fedora 14, kernel 2.6.35.14):

[    9.053574] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
[    9.053594] r8169 0000:06:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[    9.053689] r8169 0000:06:00.0: setting latency timer to 64
[    9.053740] r8169 0000:06:00.0: irq 47 for MSI/MSI-X
[    9.053830] r8169 0000:06:00.0: eth0: RTL8168d/8111d at 0xffffc90012998000, 6c:f0:49:b7:67:91, XID 083000c0 IRQ 47

Both are configured with static IPv4/v6 addresses (no NetworkManager).
The only other config difference I can think of is that the "okay"
computer is using bridging (eth0 in br0, IP config on br0) so I can
bridge virtual machines to the LAN.

-- 
Chris Adams <cmadams@...aay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.
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