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    SubjectRe: Sun GEM PPC32 Bug?
    Here is the cpuinfo:

    cat /proc/cpuinfo
    processor : 0
    cpu : 7447A, altivec supported
    clock : 1833.333326MHz
    revision : 1.1 (pvr 8003 0101)
    bogomips : 83.31

    processor : 1
    cpu : 7447A, altivec supported
    clock : 1833.333326MHz
    revision : 1.1 (pvr 8003 0101)
    bogomips : 83.31

    total bogomips : 166.63
    timebase : 41659035
    platform : PowerMac
    model : PowerMac3,6
    machine : PowerMac3,6
    motherboard : PowerMac3,6 MacRISC2 MacRISC Power Macintosh
    detected as : 129 (PowerMac G4 Windtunnel)
    pmac flags : 00000010
    L2 cache : 256K unified
    pmac-generation : NewWorld
    Memory : 2048 MB

    The problems comes only when network going over 40MBit. Have tested with rsync and FTP. Same problem with samba connection.

    Ragards
    Rüdiger Herbst

    On Sun, 2011-02-06 at 16:01 +0100, R. Herbst wrote:

    > Am 06.02.2011 00:45, schrieb Benjamin Herrenschmidt:
    >
    >>
    >> Actually, the second one is trivial, just modify gem_rxmac_interrupt()
    >> as follow:
    >>
    >> if (rxmac_stat& MAC_RXSTAT_OFLW) {
    >> u32 smac = readl(gp->regs + MAC_SMACHINE);
    >>
    >> netdev_err(dev, "RX MAC fifo overflow smac[%08x]\n", smac);
    >> gp->net_stats.rx_over_errors++;
    >> gp->net_stats.rx_fifo_errors++;
    >>
    >> - ret = gem_rxmac_reset(gp);
    >> + ret = 1;
    >> }
    >>
    >> And tell us if that makes a difference.
    >>
    >> Cheers,
    >> Ben.
    >>
    >>
    >


    Am 07.02.2011 06:34, schrieb Benjamin Herrenschmidt:
    > What's your machine model (cat /proc/cpuinfo) and what do you do to
    > trigger the problem ? I'm trying to reproduce here and so far had
    > no success doing so.
    >
    > Cheers,
    > Ben.
    >
    >> Okay. I have made the change. The only difference is that:
    >>
    >> In /var/log/messages
    >> Feb 6 15:52:12 G4 kernel: gem 0002:20:0f.0: eth0: RX MAC fifo
    >> overflow smac[00810400]
    >> Feb 6 15:52:12 G4 kernel: gem 0002:20:0f.0: eth0: Link is up at 1000
    >> Mbps, full-duplex
    >> Feb 6 15:52:12 G4 kernel: gem 0002:20:0f.0: eth0: Pause is disabled
    >> Feb 6 15:57:10 G4 kernel: NETDEV WATCHDOG: eth0 (gem): transmit queue
    >> 0 timed out
    >> Feb 6 15:57:10 G4 kernel: ------------[ cut here ]------------
    >> Feb 6 15:57:10 G4 kernel: WARNING: at net/sched/sch_generic.c:258
    >> Feb 6 15:57:10 G4 kernel: Modules linked in: radeon ttm
    >> drm_kms_helper drm hwmon power_supply ipv6 snd_pcm_oss snd_mixer_oss
    >> snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device
    >> snd_powermac snd_pcm snd_timer snd soundcore snd_page_alloc dm_mod
    >> uninorth_agp sungem agpgart sungem_phy
    >> Feb 6 15:57:10 G4 kernel: NIP: c03dceec LR: c03dceec CTR: 00000001
    >> Feb 6 15:57:10 G4 kernel: REGS: effefe20 TRAP: 0700 Not tainted
    >> (2.6.37-gentoo)
    >> Feb 6 15:57:10 G4 kernel: MSR: 00029032<EE,ME,CE,IR,DR> CR:
    >> 44200084 XER: 20000000
    >> Feb 6 15:57:10 G4 kernel: TASK = ef854cb0[0] 'swapper' THREAD: ef878000 CPU: 1
    >> Feb 6 15:57:10 G4 kernel: GPR00: c03dceec effefed0 ef854cb0 0000003e
    >> 00001032 ffffffff c059f182 2074696d
    >> Feb 6 15:57:10 G4 kernel: GPR08: 000069f7 effee000 01ea1000 00000004
    >> ffffffff fff80b18 fff80154 00000000
    >> Feb 6 15:57:10 G4 kernel: GPR16: 00000420 c03dcd4c c0589084 00200200
    >> c04c9786 ef888814 ef888a14 ef888c14
    >> Feb 6 15:57:10 G4 kernel: GPR24: 00000001 ffffffff ef12e7a0 00000002
    >> 00000001 00000000 ef8141d4 ef814000
    >> Feb 6 15:57:10 G4 kernel: NIP [c03dceec] dev_watchdog+0x1a0/0x2e4
    >> Feb 6 15:57:10 G4 kernel: LR [c03dceec] dev_watchdog+0x1a0/0x2e4
    >> Feb 6 15:57:10 G4 kernel: Call Trace:
    >> Feb 6 15:57:10 G4 kernel: [effefed0] [c03dceec]
    >> dev_watchdog+0x1a0/0x2e4 (unreliable)
    >> Feb 6 15:57:10 G4 kernel: [effeff40] [c0043db4] run_timer_softirq+0x1ac/0x260
    >> Feb 6 15:57:10 G4 kernel: [effeffa0] [c003d9cc] __do_softirq+0x118/0x1ec
    >> Feb 6 15:57:10 G4 kernel: [effefff0] [c0011398] call_do_softirq+0x14/0x24
    >> Feb 6 15:57:10 G4 kernel: [ef879ea0] [c000687c] do_softirq+0x88/0xb4
    >> Feb 6 15:57:10 G4 kernel: [ef879ec0] [c003d178] irq_exit+0x54/0x74
    >> Feb 6 15:57:10 G4 kernel: [ef879ed0] [c000ead4] timer_interrupt+0x154/0x190
    >> Feb 6 15:57:10 G4 kernel: [ef879ee0] [c0012080] ret_from_except+0x0/0x14
    >> Feb 6 15:57:10 G4 kernel: --- Exception: 901 at cpu_idle+0xe0/0x180
    >> Feb 6 15:57:10 G4 kernel: LR = cpu_idle+0xd4/0x180
    >> Feb 6 15:57:10 G4 kernel: [ef879fa0] [c000a4f8] cpu_idle+0x170/0x180
    >> (unreliable)
    >> Feb 6 15:57:10 G4 kernel: [ef879fc0] [c044952c] start_secondary+0x314/0x350
    >> Feb 6 15:57:10 G4 kernel: [ef879ff0] [00003270] 0x3270
    >> Feb 6 15:57:10 G4 kernel: Instruction dump:
    >> Feb 6 15:57:10 G4 kernel: 2f800001 41be003c 38810008 7fe3fb78
    >> 38a00040 4bfe77c9 7fa6eb78 7fe4fb78
    >> Feb 6 15:57:10 G4 kernel: 7c651b78 3c60c050 3863ed12 48068721
    >> <0fe00000> 38000001 3d20c05c 9809d3bc
    >> Feb 6 15:57:10 G4 kernel: ---[ end trace 876ff0d47c88271d ]---
    >> Feb 6 15:57:10 G4 kernel: gem 0002:20:0f.0: eth0: transmit timed out, resetting
    >> Feb 6 15:57:10 G4 kernel: gem 0002:20:0f.0: eth0:
    >> TX_STATE[00000001:00000000:00000001]
    >> Feb 6 15:57:10 G4 kernel: gem 0002:20:0f.0: eth0:
    >> RX_STATE[0609441d:00000001:00000001]
    >> Feb 6 15:57:10 G4 kernel: gem 0002:20:0f.0: eth0: Link is up at 1000
    >> Mbps, full-duplex
    >> Feb 6 15:57:10 G4 kernel: gem 0002:20:0f.0: eth0: Pause is disabled
    >> ---
    >> It seems that the Network dies and halt for ca. 25 seconds. After a
    >> while it comes a call trace and the rsync session is dead. But not the
    >> hole system dies.
    >>
    >> Regards
    >> Rüdi
    >>
    >
    >

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