ALTQ, pf and VLANs

Yar Tikhiy yar at
Sun Apr 3 05:56:57 PDT 2005

On Thu, Mar 31, 2005 at 04:45:52PM +0100, Max Laier wrote:
> On Thursday 31 March 2005 04:38, Marko ??uk wrote:
> > Max, that solution works fine. I have tried it and it works fine for me.
> >
> > Thanks.
> >
> > Anyway, do you know some issues with dropping traffic on em0 vlan
> > enabled interfaces and  tcpdump-ing ? The average traffic, that we
> > tcpdump is cca 10-20mbit/s and when tcpdump-ing, we get allmost 90%
> > packet loss on interfaces. Any clue ?
> Ugh, I know of such an issue, but was thinking that it should be fixed by now.  
> Can you make sure that you have your kernel/em(4) built with if_em.c 
> or later?  The effect should simply be that it disables VLAN hardware support 
> which doesn't seem to work with promiscuous mode.  You could also try to 
> disable it manually (ifconfig) to see if that improves on the packet loss.

Max, I'm not sure it's using VLAN acceleration in em(4) that causes
_partial_ packet loss.  The case you referred to manifested itself
in full traffic halt on attached vlan(4) interfaces and not in its
partial loss.


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