Subject: Re: Multiqueue and virtualization WAS(Re: [PATCH 3/3] NET: [SCHED] Qdisc changes and sch_rr added for multiqueue

From: Ben Greear <[email-masked]>
Date: Fri, 29 Jun 2007 08:33:06 -0700

Patrick McHardy wrote:
> Right, but the current bridging code always uses promiscous mode
> and its nice to avoid that if possible. Looking at the code, it
> should be easy to avoid though by disabling learning (and thus
> promisous mode) and adding unicast filters for all static fdb entries.
>   
I am curious about why people are so hot to do away with promisc mode.  
It seems to me
that in a modern switched environment, there should only very rarely be 
unicast packets received
on an interface that does not want to receive them.

Could someone give a quick example of when I am wrong and promisc mode 
would allow
a NIC to receive a significant number of packets not really destined for it?

Thanks,
Ben

-- 
Ben Greear <[email-masked]> 
Candela Technologies Inc  http://www.candelatech.com