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    Subject[bug] forcedeth: hung interface under load

    * Ingo Molnar <> wrote:

    > > I had responded eariler to the thread asking you to try out the patch
    > > found in bug 8058:
    > >
    > >
    > > I believe that is the caush of the NULL skb dereference issue.
    > there's a different type of regression now: under high load i dont get
    > a crash, i get a hung interface instead. No error packets or other
    > weird interface state - just a hung interface. [...]

    the interface stats do not change from that point on:

    eth1 Link encap:Ethernet HWaddr 00:13:D4:DC:41:12
    inet addr: Bcast: Mask:
    RX packets:14976 errors:0 dropped:0 overruns:0 frame:0
    TX packets:3928743 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:1028544 (1004.4 KiB) TX bytes:4126766510 (3.8 GiB)
    Interrupt:16 Base address:0xa000

    and the irq count does not change either:

    16: 816 3463148 IO-APIC-fasteoi eth1

    no matter what i do to the interface. So it's completely stuck.
    No kernel messages either - apparently nv_tx_timeout() never triggered.

    note, the hang occurs faster if you set max_interrupt_work to a really
    low value (such as 0). [ The hang occurs _much_ faster if you apply the
    -rt patch and enable PREEMPT_RT - but the hang occurs on mainline too. ]

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      Last update: 2007-04-03 09:09    [W:0.021 / U:15.920 seconds]
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