Re: [Xen-devel] [PATCH] Network Checksum Removal

[Andrew Theurer <habanero@xxxxxxxxxx>]

On Monday 23 May 2005 10:31, Bin Ren wrote:
> It seems to break the interdomain ssh and nfs on my machine. Digging
> for reasons.

Are you using bridge or network model?
>
> - Bin
>
> On 5/23/05, Andrew Theurer <habanero@xxxxxxxxxx> wrote:
> > > I've checked in a modified version of your patch that hopefully
> > > deals with propagating checksum information in both directions
> > > across a virtual bridge or router. I replaced your skb flags with
> > > two new ones -- proto_csum_blank and proto_csum_valid.
> > >
> > > The former indicates that the protocol-level checksum needs
> > > filling in. This is not a problem for local processing, but the
> > > flag is picked up before sending to a physical interface and
> > > fixed up.
> > >
> > > The latter indicates that the proto-level checksum has been
> > > validated since arrival at localhost (*or* that the packet
> > > originated from a domU on localhost). This flag survives crossing
> > > a bridge/router so we can trust it when deciding if checksum
> > > validation is required.
> > >
> > > I'll push the patch to the bkbits repository just as soon as
> > > bkbits rematerialises. :-)
> > >
> > > If you have any performance or stress tests that you were using
> > > to test checksum offloading, it would be great to find out how
> > > they perform on the checked-in version!
> >
> > Now that BK is up, I'll run some netperf tests before/after that
> > changeset and see what we get.
> >
> > -Andrew
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel


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