2.6.26/tg3 ping roundtrip times > 2000 ms on local network

[Marc Haber <mh+linux-kernel@zugschlus.de>]

Hi,

I have one HP DL 140 G1 running with Debian stable and a
locally-built, vanilla kernel. With 2.6.25.11, everything is fine.

But, after updating to 2.6.26.2, I noticed that pinging the host on
the local ethernet sometimes (e.g. several times a minute, but not
always) results in a round-trip time of larger than two seconds. The
packets are not lost though, they're only severly delayed. For an ssh
session to the host, this feels like somebody rocking a bad network
connector. The same behavior is visible with 2.6.26 and 2.6.26.1.

Going back to 2.6.25.11 immediately fixes the issue for me.

Syslog doesn't say anything conspicious, unfortunately. As I don't
have local access to the box, I cannot say whether it's only the
network that freezes or whether it's the entire box.

Does it make sense to test any later 2.6.25.x kernel, or is there any
post-2.6.26 patch available that may fix the issue for me?

Strangely, another DL 140 from the same charge runs just fine with
2.6.26.2.

Here is the output of lspci -vvv for the network interface:

02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit Ethernet (rev 02)
        Subsystem: Broadcom Corporation NetXtreme BCM5704 Gigabit Ethernet
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 64 (16000ns min), Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 19
        Region 0: Memory at febc0000 (64-bit, non-prefetchable) [size=64K]
        Region 2: Memory at febb0000 (64-bit, non-prefetchable) [size=64K]
        Expansion ROM at <ignored> [disabled]
        Capabilities: [40] PCI-X non-bridge device
                Command: DPERE- ERO- RBC=2048 OST=1
                Status: Dev=02:00.0 64bit+ 133MHz+ SCD- USC- DC=simple DMMRBC=2048 DMOST=1 DMCRS=16 RSCEM- 266MHz- 533MHz-
        Capabilities: [48] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
                Status: D0 PME-Enable+ DSel=0 DScale=1 PME-
        Capabilities: [50] Vital Product Data
        Capabilities: [58] Message Signalled Interrupts: Mask- 64bit+ Queue=0/3 Enable-
                Address: 1502da2a94a95200  Data: 3ca4

If there is any information that can help, please say so.

Greetings
Marc

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