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    SubjectSMP, APIC and networking issues...
    Hi all:

    There have been some recent posts regarding some
    SMP/register corruption bugs.

    Searching the archives, there have also been some
    reports with both 3com and intel ethernet cards
    hanging after an N amount of time, where N = a couple
    of days to 2 weeks. That is, the nic's will behave
    nicely for some time and then totally hang - are not
    even pingable. This happens on SMP machines and is
    believed to be caused by some APIC/interrupt issues.

    I have seen the exact same behavior on 2.4.7 with
    a intel pro/100 ethernet 64 bit PCI nic on a SMP
    intel chipset. Stress testing and transferrring
    Gbytes of data thru the nic works fine after the
    machine is rebooted but after say 3 days, the
    card just hangs. (this happens with both intel
    supplied and kernel supplied drivers, e100, eepro100)

    After the hang, logging in via the console and
    saying ifconfig (for eth1, I have also blacked
    out the IP address) shows the following:

    eth1 Link encap:Ethernet HWaddr
    inet addr:x.x.x.x
    Bcast: Mask:
    RX packets:6232292 errors:0 dropped:0
    overruns:0 frame:0
    TX packets:7098591 errors:0 dropped:0
    overruns:0 carrier:0
    collisions:0 txqueuelen:100
    RX bytes:2693585563 (2568.8 Mb) TX
    bytes:2786888257 (2657.7 Mb)
    Interrupt:15 Base address:0x4000

    The supposed trick is to boot with a "noapic"
    option, since this is believed to be a APIC issue,
    not a driver issue (as mentioned, this problem
    has been seen for both 3com and intel cards).

    Is "noapic" still the recommended approach for SMP
    kernels or is it advisable to use 2.4.9 to solve
    this specific issue ?

    Best regards,


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