RE: [Xen-users] Attempt to allocate order 5 skbuff. Increase MAX_SKBUFF_ORDER

["Fischer, Anna" <anna.fischer@xxxxxx>]

> Subject: RE: [Xen-users] Attempt to allocate order 5 skbuff. Increase
> MAX_SKBUFF_ORDER
> 
> >>> Well if you don't need it then just try and remove the NAT module
> >> using "modprobe -r iptable_nat". And see if that makes any
> difference.
> >>>
> >>
> >> Can't remove it, get the message
> >> "module is in use".. not sure by what.
> >
> > Do you have any rules in the NAT table? E.g. check "iptables -t nat -
> L". Then remove those rules and try removing the module again. I doubt
> that the NAT module is the core of your problem though.
> 
> Yes it turns out we did.  This server is an LVS "real server" back
> end and Horm's transparent proxy is in use.  that's
> what the NAT is being used for.
> 
> >>>
> >> CONFIG_XEN_SKBUFF is on in my config.
> >> There is no MAX_SKBUFF_ORDER parameter anywhere in my source tree,
> >> much less the config file.
> >
> > MAX_SKBUFF_ORDER is not a configuration option. It is part of the
> Dom0/DomU kernel code.
> 
> I have grepped the whole kernel code from the kernel which I'm
> running, which is unmodified from the redhat SRPMS as delivered with
> version 5, update 3. 2.6.18-128.1.6.el5xen.  I don't find
> the string MAX_SKBUFF_ORDER anywhere in there.  Which source file
> should
> it be in?
> 
> 
> >
> > Your posted kernel config is from your Dom0? You said before that you
> are running a 64-bit Dom0. You need to check the CONFIG_XEN_SKBUFF
> option in the Dom0 config. I am in general wondering if you might have
> issues with your DomU/Dom0 configuration. How did you install those
> kernels? Did you install them using the distro? Did you compile them
> yourself? I assume you also run a 64-bit hypervisor?
> 
> Yes running 64-bit dom0 and hypervisor.  the kernel config
> is actually the same for both dom0 and domU as in redhattish xen
> you actually run the same kernel-xen in both.  Only difference is
> that it is 64-bit for the dom0 and 32-bit for the domU.

How can you have the same kernel configuration for a 32-bit and a 64-bit system 
? Have you edited those yourself and then compiled the kernels ? There are a 
lot of dependencies around the CONFIG_X86_64, CONFIG_X86_32 etc defines.

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