Re: [Xen-devel] Problem with VLANs on tg3 NICs

[Evan Bigall <evan.bigall@xxxxxxxxxxx>]

> If its broadcasting all VLAN-tagged traffic to all ports that's
> disastrous for performance. You'd be much better off setting up a
> separate bridge for each VLAN. Alternatively, it might be worth looking
> at The Linux Switching Appliance (LISA) project -- their bridge supports
> VLAN trunks.
>  
I'd have to do a tcpdump to be sure but empirically I haven't noticed 
any performance problems (and these are nfs booted images).
All I'm expecting of the bridge code is that it ignore the tag and 
deliver the packet by mac address as normal. Because all this works with 
other than the tg3 driver I'm confident the bridge code is doing what I 
expect.  The problem is not with the bridge, the problem is with the tg3 
driver. I believe that any network utility on top of the tg3 driver 
would have the same problem, as the tg3 driver is stripping the vlan 
tags before it passes them on.
Evan



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