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[Xen-devel] Re: Trouble with TCP between domUs

  • To: xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: David Edmondson <dme@xxxxxxx>
  • Date: Fri, 08 Dec 2006 07:04:54 +0000
  • Cancel-lock: sha1:mXbcHnEDPmomVKUSyi8CZTfMj88=
  • Delivery-date: Thu, 07 Dec 2006 23:04:21 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

* herbert@xxxxxxxxxxxxxxxxxxx [2006-12-08 05:19:46]
> David Edmondson <dme@xxxxxxx> wrote:
>> I worry about what seems like a lack of clarity around what checksum
>> offload capability is assumed by a domain about its' peer.
> In Linux we support protocol-neutral checksum offload.  This works
> whereby the guest simply sets an offset where we should store the
> final checksum and an offset where the checksum should be computed
> from.

The inter-domain protocol has no facility to allow the guest to
specify the offset at which the checksum should be placed - how does
the peer know where to put it?

And "Protocol neutral" means "as long as the checksum algorithm used
is the IP one" :-)

David Edmondson, Sun Microsystems, http://www.dme.org

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