Re: [Xen-devel] Problem with MTU > 1500, ifconfig segmentation fault

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 12 Sep 2005, at 22:48, Satish Raghunath wrote:

> I modified the
> xen-2.0.7/linux-2.6.11-xen-sparse/arch/xen/kernel/skbuff.c to borrow
> changes from the same file in the 3.0 branch. I omitted calls to
> "xen_create_contiguous_region" and "xen_destroy_contiguous_region" 
> since
> they seemed to call newer hypercalls. The resulting patch is pasted
> below. I am able to ping with large frames (up to 8174 bytes). I have
> not tested this beyond "ping -s", so I am not sure if this is the right
> way to do it.
>
> Is the call to "xen_create_contiguous_region" necessary or is it a
> performance enhancement?
The call to xen_create_contiguous_memory() is important, but it's 
called something else in 2.0 (xen_contig_memory()). It's used in the 
same way though. The call to xen_destroy_contiguous_memory() can be 
safely left out.
Without using xen_contig_memory, you'll find that jumbo frames will 
fail if you do a debug build of Xen.
If you add that in then we'll take the patch. Thanks!

 -- Keir


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