[K12OSN] users kicked out on 4.2.1

[Julius Szelagiewicz]

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>
>
> On Fri, 15 Apr 2005, Julius Szelagiewicz wrote:
>
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>> > Julius Szelagiewicz wrote:
>> >>
>> >> I upped the ping interval to 30 seconds, to no avail. one station
>> >> spontaneously lost display twice, but over the course of the week it
>> >> happened to all the stations. Maybe switches - relatively new HP
>> >> Procurve,
>> >> limited management capability. I am now running continous ping to the
>> >> station that had most problems. I wonder if I'll see any packet loss.
>> My
>> >> gut feeling (and I do have a considerable gut) is that this is -not-
>> a
>> >> hardware issue. I'll concentrate on watching one station and I'll get
>> >> all
>> >> the data about it from the /var/log/messages at the end of the day.
>> >> Maybe
>> >> it will point us to something. The ping now running will tell us if
>> >> there
>> >> is a real networking issue, or is gdm imagining something.
>> >> thanks, julius
>> >>
>> >
>> >
>> >
>> > If this turns out to be a GDM-specific bug, you can turn this feature
>> > off completely by setting the ping interval to 0.
>> >
>> > 	PingIntervalSeconds=0
>> >
>> >
>> Eric, thank you, very good point. Why didn't I think of it :-)
>> I'll do that. As you can see from the message that crossed ways with
>> yours, it doesn't seem to be a network issue. julius
>
> But, the pinginterval is there for a reason.  To detect displays that
> have dissappeared or are hung up for some reason.
>
> That's how GDM knows that it should kill any child processes if a user
> turns off their terminal.
>
> Also, the 'ping' that you are running is an icmp echo request.
>
> The 'ping' that gdm is running is an X request.
>
> It's sounding to me like your Xserver has hung, but your kernel is still
> responding to icmp pings.
>
> The next trick will be figuring out why your Xserver would hang.
>
>
> Jim McQuillan
> jam at Ltsp.org
>
Jim,
 you are right, of course, on the other hand it happend quite a few times
that people were actively using the terminals, say typing into gnome
terminal with characters reflected from the host showing onn the screen,
but the xserver would go poof!. I'm not sure that xserver hangs, but it
certainly doesn't respond to the X client satisfaction. I'll try to turn
off the X ping and see if the big problem goes away. If it does, we'll
have to find what is the problem with xserver. julius


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