RE: [Xen-devel] [PATCH] MAC Matching vif-route & tip

[Andy Lee <andylee@xxxxxxxx>]

At 10:44 AM 9/7/2005, Ian wrote:

> > This patch will setup iptable rules for vif's that does MAC
> > matching, as PHYSDEV matching only works for bridged devices.
>
> Is that definitely the case? I don't see why physdev shouldn't work with
> routed setups.
Yes.  I first noticed the the byte counters of Physdev iptable rules being 
stuck at 0.  They don't catch routed packets.  Then I read:
CONFIG_IP_NF_MATCH_PHYSDEV: 

"Physdev packet matching matches against the physical bridge 
ports                                                           the IP 
packet arrived on or will leave by."
Using menuconfig, as I disable "802.1d Ethernet Bridging" from Networking, 
Physdev disappears from the netfilter menu too.
> > On a separate but still networking issue, I noticed that my
> > XenU's outbound traffic is sporadic (between 800KB/sec and
> > 2MB/sec).  The problem is the default qdisc being inadequate.
> >  So I fix it with:
> >
> > XenU# tc qdisc add dev eth0 root tbf rate 50mbit latency 20ms
> > burst 50k
>
> How much more buffering does this add?
As I understand it, the buffer must complement the network speed.  Default 
i386 kernel uses 100 HZ, or 10ms time slices.  Thus 50mbits/sec fills 50KB 
in 10ms.  

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