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

On 25 May 2005, at 22:35, Jon Mason wrote:

The problem with the bridge device is that all traffic generated in dom0 will be software checksummed, regardless of whether it needs to be or not. In Xen's case, it will software checksum all traffic to domU, even though the
vif device is advertising NETIF_F_NO_CSUM.

This is because the stack doesn't see the features of the children devices of the bridge, only the features of the bridge device itself. I created a quick hack to work around this, and started the discussion on the Linux netdev mailing list about how to fix the problem. From this discussion, a patch was created which does most of what we want, but needs to be slightly modified to be optimal for Xen. I will post the Xen optimized patch as soon as I have it

But we no longer bring up an IP interface on the bridge device -- we use veth0 instead, which advertises NETIF_F_IP_CSUM.

 -- Keir

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