Re: [PATCH 0/12] virtio_net perf patches

Anthony Liguori
2008-08-12T18:29:10Z

Mark McLoughlin wrote:
> Yes, I've been through this before. See:
>
> https://bugzilla.redhat.com/231444
>
> So, we've had this long-standing dhclient patch in Fedora:
>
> http://cvs.fedoraproject.org/viewcvs/*checkout*/rpms/dhcp/devel/dhcp-4.0.0-xen-checksum.patch
>
> Herbert - any clue why this isn't upstream? That's quite surprising ...
>

I've confirmed that it's not in any of the upstream releases. However,
dhcp has a weird model where you have to pay a membership fee to have
access to the CVS repository or development mailing list?

I'm not sure what's the best way to proceed.

Regards,

Anthony Liguori

> Ah, I see Rusty moved this to linux-netdev without cc-ing:
>
> http://marc.info/?l=linux-netdev&m=121844837826895
>
> Herbert wrote:
>
> "One easy way of doing this is to hook up the rx checksum offload
> option in the guest with the tx offload option in the host. In
> other words, when rx offload is enabled in the guest we enable
> tx offload in the host, and disable it vice versa."
>
> Are you basically just saying that guests with a "broken" dhclient
> should manually disable rx checksum offload with ethtool? And that the
> host should react by disabling tx offload on the tap interfacE?
>
> Cheers,
> Mark.
>
>