Mark McLoughlin wrote:
Hi Avi,
Here's the set of patches that I think make sense to apply.
We probably need to disable checksum offload on the RX side until we
figure out what to do about the broken dhclient. That's going to hit a
lot of users otherwise.
Regards,
Anthony Liguori
I've left out Anthony's zero-copy patch since I wasn't seeing
a measurable difference with it, it's quite invasive and isn't safe
with the "drop the global mutex during tapfd read()" patch.
I left that mutex patch 'til last since you may still be
nervous about concurrency issues and also the posix-timers kernel race
that it triggers.
Another change since the first round of patches is that it
took a bit of ugly hackery to handle the case where IFF_VNET_HDR
is supported and we're using e.g. e1000. Since it's difficult to
only enable IFF_VNET_HDR when we're using virtio_net_hdr, I went with
this approach.
Lastly, I need to add a "vnet_hdr=on" param to "-net tap" so
that we can know if the supplied tap fd has IFF_VNET_HDR enabled.
There's no interface to query that on the fd right now, and even if
I did cook up a patch it probably wouldn't make 2.6.27.
Cheers,
Mark.
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