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    SubjectRe: sky2 hangs
    On Thu, 1 Feb 2007 19:55:32 +0100
    Thomas Glanzmann <thomas@glanzmann.de> wrote:

    > Hello,
    > I have a sky2 network card in my intel mac mini. It stops working when I
    > do havy network load like watching a divx over http/sshfs. However if I
    > remove the driver module and load it again it works and even the tcp
    > connection doesn't get shutdown. I automated the above procedure using
    > a userland watchdog which basically does the same thing and is written
    > entirely by me, because the traditional watchdog wasn't that reliable
    > and did a lot of false positives:
    >
    > * Look every ten seconds if my default router is pingable (3
    > pings, one has to get back).
    > If it isn't the case I call network_fix script (it calls the
    > script only once after a ping gets lost. To run the script again at least one
    > ping has to arrive again)
    >
    > (mini) [~] cat /usr/local/sbin/fix_network
    > #!/bin/bash
    >
    > export PATH=/bin:/usr/bin:/usr/sbin:/sbin
    >
    > rmmod sky2
    > modprobe sky2
    > ifdown eth0
    > ifup eth0
    >
    > If after that no ping is received from the default
    > router for another 90 seconds I tell init to reboot and
    > stop feeding the kernel software watchdog.
    >
    > * My watchdog also checks if sshd process is running. If it is
    > down for more than 100 seconds it reboots the machine, too.
    >
    > Jan 27 22:35:35 mini watchdog-tg[4146]: No PONG received from 192.168.0.3 (failure 1 of 10)
    > Jan 27 22:35:35 mini watchdog-tg[4146]: Running fix_network script.
    > Jan 27 22:38:46 mini watchdog-tg[4146]: No PONG received from 192.168.0.3 (failure 1 of 10)
    > Jan 27 22:38:46 mini watchdog-tg[4146]: Running fix_network script.
    > Jan 27 22:44:17 mini watchdog-tg[4146]: No PONG received from 192.168.0.3 (failure 1 of 10)
    > Jan 27 22:44:17 mini watchdog-tg[4146]: Running fix_network script.
    > Jan 29 12:00:13 mini watchdog-tg[4146]: No PONG received from 192.168.0.3 (failure 1 of 10)
    > Jan 29 12:00:13 mini watchdog-tg[4146]: Running fix_network script.
    > Jan 29 19:18:59 mini watchdog-tg[4146]: No PONG received from 192.168.0.3 (failure 1 of 10)
    > Jan 29 19:18:59 mini watchdog-tg[4146]: Running fix_network script.
    > Jan 31 15:56:29 mini watchdog-tg[4146]: No PONG received from 192.168.0.3 (failure 1 of 10)
    > Jan 31 15:56:29 mini watchdog-tg[4146]: Running fix_network script.
    > Feb 1 08:56:57 mini watchdog-tg[4146]: No PONG received from 192.168.0.3 (failure 1 of 10)
    > Feb 1 08:56:57 mini watchdog-tg[4146]: Running fix_network script.
    >
    > I have a question to this: I wonder why the Linux Kernel (no longer?)
    > increments the use counter of an ethernet driver (I saw it on sky2 and
    > e1000) when the interface is up, running and configured? I can unload
    > the sky2 driver without doing a 'ifconfig eth0 down' beforehand. Could
    > somone provide me with background on this fact?

    It was intentional in 2.6 to allow interfaces to be hot-removed.
    Remember with Internet protocols there is no hard binding (normally)
    between address and device and connections should not go down
    if link fails.

    >
    > With that everything works. If somone is interested in my userland
    > watchdog, just send me an E-Mail.

    Hopefully, it won't be necessary for long.
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