FC4 - IBM e326 - network problems.

From: Naoki (naoki_at_valuecommerce.com)
Date: 08/22/05

  • Next message: Jack Howarth: "better trackpad settings?" 
    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Mon, 22 Aug 2005 12:53:24 +0900

    Hi all.

    I have a networking problem here I'd like to share.

    Cut down FC4 build on an IBM e326.

    I am attempting to SCP 2.4MB of data to this box ( from anywhere the
    results are the same ).

    It connects, asks for password, which I give. And then after a few
    packets I see it all go very ugly indeed. Throwing retransmissions and,
    segment losts, and DUP ACK messages.
    Which just kills the scp with a "Stalled" message. If I leave it then
    _eventaully_ the file will transfer.

    I've changed switches and have the same result. Starting to wonder if
    there is a problem with the Broadcom ethernet controller? One of the
    reasons I suspect the controller is performance jumps to normal (good)
    after I reinitialise the card.

    Server end :

      4.913749 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=144
      4.916377 10.0.2.31 -> 10.0.2.27 SSHv2 Encrypted response packet
    len=32
      4.916533 10.0.2.27 -> 10.0.2.31 TCP 60952 > ssh [ACK] Seq=1293
    Ack=1597 Win=8400 Len=0 TSV=2056922151 TSER=5310028
      4.916828 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=64
      4.916965 10.0.2.31 -> 10.0.2.27 SSHv2 Encrypted response packet
    len=48
      4.917276 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=64
      4.918916 10.0.2.31 -> 10.0.2.27 SSHv2 Encrypted response packet
    len=48
      4.958139 10.0.2.27 -> 10.0.2.31 TCP 60952 > ssh [ACK] Seq=1421
    Ack=1693 Win=8400 Len=0 TSV=2056922193 TSER=5310031
      4.958153 10.0.2.31 -> 10.0.2.27 SSHv2 Encrypted response packet
    len=48
      4.958306 10.0.2.27 -> 10.0.2.31 TCP 60952 > ssh [ACK] Seq=1421
    Ack=1741 Win=8400 Len=0 TSV=2056922193 TSER=5310070
      4.958609 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=64
      4.958762 10.0.2.31 -> 10.0.2.27 SSHv2 Encrypted response packet
    len=48
      4.962323 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      4.962446 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      4.962451 10.0.2.31 -> 10.0.2.27 TCP ssh > 60952 [ACK] Seq=1789
    Ack=4381 Win=15424 Len=0 TSV=5310074 TSER=2056922196
      4.962986 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      4.963239 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Previous segment
    lost] Encrypted request packet len=1448
      4.963244 10.0.2.31 -> 10.0.2.27 TCP ssh > 60952 [ACK] Seq=1789
    Ack=5829 Win=18320 Len=0 TSV=5310075 TSER=2056922197 SLE=7277 SRE=8725
      4.963780 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      4.963785 10.0.2.31 -> 10.0.2.27 TCP [TCP Dup ACK 46#1] ssh >
    60952 [ACK] Seq=1789 Ack=5829 Win=18320 Len=0 TSV=5310076
    TSER=2056922197 SLE=7277 SRE=10173
      5.178550 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Retransmission]
    Encrypted request packet len=1448
      5.178557 10.0.2.31 -> 10.0.2.27 TCP ssh > 60952 [ACK] Seq=1789
    Ack=10173 Win=21216 Len=0 TSV=5310290 TSER=2056922413
      5.179217 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Previous segment
    lost] Encrypted request packet len=1448
      5.179221 10.0.2.31 -> 10.0.2.27 TCP [TCP Dup ACK 50#1] ssh >
    60952 [ACK] Seq=1789 Ack=10173 Win=21216 Len=0 TSV=5310291
    TSER=2056922413 SLE=11621 SRE=13069
      5.179741 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      5.179745 10.0.2.31 -> 10.0.2.27 TCP [TCP Dup ACK 50#2] ssh >
    60952 [ACK] Seq=1789 Ack=10173 Win=21216 Len=0 TSV=5310292
    TSER=2056922413 SLE=11621 SRE=14517
      5.180252 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      5.180255 10.0.2.31 -> 10.0.2.27 TCP [TCP Dup ACK 50#3] ssh >
    60952 [ACK] Seq=1789 Ack=10173 Win=21216 Len=0 TSV=5310292
    TSER=2056922413 SLE=11621 SRE=15965
      5.391515 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Retransmission]
    Encrypted request packet len=1448
      5.391520 10.0.2.31 -> 10.0.2.27 TCP ssh > 60952 [ACK] Seq=1789
    Ack=15965 Win=24112 Len=0 TSV=5310503 TSER=2056922626
      5.392043 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      5.392048 10.0.2.31 -> 10.0.2.27 TCP ssh > 60952 [ACK] Seq=1789
    Ack=17413 Win=27008 Len=0 TSV=5310504 TSER=2056922626
      5.603540 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Out-Of-Order]
    Encrypted request packet len=1448
      5.603546 10.0.2.31 -> 10.0.2.27 TCP [TCP Dup ACK 60#1] ssh >
    60952 [ACK] Seq=1789 Ack=17413 Win=27008 Len=0 TSV=5310715
    TSER=2056922838 SLE=15965 SRE=17413

    Broadcom Corporation NetXtreme BCM5704 Gigabit Ethernet - tg3 driver.
    # ethtool eth0
    Settings for eth0:
            Supported ports: [ MII ]
            Supported link modes: 10baseT/Half 10baseT/Full
                                    100baseT/Half 100baseT/Full
                                    1000baseT/Half 1000baseT/Full
            Supports auto-negotiation: Yes
            Advertised link modes: Not reported
            Advertised auto-negotiation: No
            Speed: 100Mb/s
            Duplex: Full
            Port: Twisted Pair
            PHYAD: 1
            Transceiver: internal
            Auto-negotiation: off
            Supports Wake-on: g
            Wake-on: d
            Current message level: 0x000000ff (255)
            Link detected: yes

    Client end :
      5.019926 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Retransmission]
    Encrypted request packet len=1448
      5.020438 10.0.2.31 -> 10.0.2.27 TCP ssh > 35380 [ACK] Seq=1789
    Ack=7277 Win=21216 Len=0 TSV=6343633 TSER=2057955472 SLE=4381 SRE=5829
      5.020513 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      5.020523 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      5.263902 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Retransmission]
    Encrypted request packet len=1448
      5.264426 10.0.2.31 -> 10.0.2.27 TCP ssh > 35380 [ACK] Seq=1789
    Ack=10173 Win=24112 Len=0 TSV=6343877 TSER=2057955920
      5.264464 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Retransmission]
    Encrypted request packet len=1448
      5.264475 10.0.2.27 -> 10.0.2.31 SSHv2 Encrypted request packet
    len=1448
      5.500935 10.0.2.27 -> 10.0.2.31 SSHv2 [TCP Retransmission]
    Encrypted request packet len=1448

    Client shows retransmissions but no DUP Ack or segment lost messages.

    Any ideas? I have other servers running with Broadcom BCM5703X chips and
    using the tg3 driver without problem. 

    -- 
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