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xen-users
[Xen-users] Re: [Xen-devel] kernel oops/IRQ exception when networking be
Am Montag, den 06.06.2005, 10:26 +0100 schrieb Keir Fraser:
[...]
> > somewhere around the magic 128 (NR_IRQS problem in 2.0.x!) when the
> > crash happens - could this hint to something?
>
> The crashes you see with free_mfn removed will be impossible to debug
> -- things are very screwed by that point. Even the crash within
> free_mfn might be far removed from the cause of the crash, if it's due
> to memory corruption.
>
> It's perhaps worth investigating what critical limit you might be
> hitting, and what resource it is that's limited. e.g., can you can
> create a few vifs, but connected together by some very large number of
> bridges (daisy chained together)? Or can you create a large number of
> vifs if they are connected together by just one bridge?
This is getting really weird - as I found out I'll enounter problems
with far fewer vifs/bridges that suspected. I just fired up a network
with 7 nodes, all with four interfaces each connected to the same four
bridge interfaces. The nodes can ping through the network, however
after a short time, the system (dom0) crashes as well. This time, it
dies in net_rx_action() at a slightly different place:
[...]
[<c02b6e15>] kfree_skbmem+0x12/0x29
[<c02b6ed1>] __kfree_skb+0xa5/0x13f
[<c028c9b3>] net_rx_action+0x23d/0x4df
[...]
Funnily, I cannot reproduce this with 5 nodes (domUs) running. I'm a
bit unsure where to go from here... Maybe I should try a different
machine for further testing.
Regards
--
Birger Tödtmann
Technik der Rechnernetze, Institut für Experimentelle Mathematik
Universität Duisburg-Essen, Campus Essen email:btoedtmann@xxxxxxxxxxxxxx
skype:birger.toedtmann pgp:0x6FB166C9
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