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Networking/Discussion/Technology/Hung system while performing a ping flood on parent and its VLAN interface./List of Posts
Forum Topic - Hung system while performing a ping flood on parent and its VLAN interface.: (4 Items)
   
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Santosh Kumar
08/21/2008 3:39 PM
post12220
Hung system while performing a ping flood on parent and its VLAN interface.   
Hi,

I have got a hung system when trying to perform a ping flood on the parent and its VLAN interfaces at the same time. 
When performing it individually, system is stable. This is not a blocking issue. What information would be useful to 
provide. Please let me know.

This is QNX 6.3.2 with Networking revision 400 and I have modified io-pkt to support one RFC 2292 feature.

Thanks,
Santosh
Sean Boudreau(deleted)
08/21/2008 3:45 PM
post12221
Re: Hung system while performing a ping flood on parent and its VLAN interface.   
On Thu, Aug 21, 2008 at 03:39:46PM -0400, Santosh Kumar wrote:
> Hi,
> 
> I have got a hung system when trying to perform a ping flood on the parent and its VLAN interfaces at the same time. 
When performing it individually, system is stable. This is not a blocking issue. What information would be useful to 
provide. Please let me know.
> 
> This is QNX 6.3.2 with Networking revision 400 and I have modified io-pkt to support one RFC 2292 feature.

Make sure you've done a shutdownhook_establish() in your
driver that detaches from the hardware (including interrupt).

-seanb
Santosh Kumar
08/21/2008 3:55 PM
post12222
Re: Hung system while performing a ping flood on parent and its VLAN interface.   
Hi Sean,

Im sorry. Can you explain a little bit more? What does shutdownhook_establish do? How is it potentially related to this 
problem?

Thanks,
Santosh
> On Thu, Aug 21, 2008 at 03:39:46PM -0400, Santosh Kumar wrote:
> > Hi,
> > 
> > I have got a hung system when trying to perform a ping flood on the parent 
> and its VLAN interfaces at the same time. When performing it individually, 
> system is stable. This is not a blocking issue. What information would be 
> useful to provide. Please let me know.
> > 
> > This is QNX 6.3.2 with Networking revision 400 and I have modified io-pkt to
>  support one RFC 2292 feature.
> 
> Make sure you've done a shutdownhook_establish() in your
> driver that detaches from the hardware (including interrupt).
> 
> -seanb
Sean Boudreau(deleted)
08/22/2008 11:01 AM
post12254
Re: Hung system while performing a ping flood on parent and its VLAN interface.   
On Thu, Aug 21, 2008 at 03:55:42PM -0400, Santosh Kumar wrote:
> Hi Sean,
> 
> Im sorry. Can you explain a little bit more? What does shutdownhook_establish do? How is it potentially related to 
this problem?

One scenario that can cause issues is when a network
driver is using a shared interrupt and io-pkt is
shutdown or faults and the hardware is not quieted.
In such a situation a NIC can leave an interrupt
asserted and the other manager that was sharing
the interrupt can spin.  You can check for shared
interrupts with 'pidin irq'.

Just a theory at this point...

Try shutdownhook_establish(), run a high prio shell,
try to avoid shared interrupts for now.

-seanb

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