netdev - Re: bridge vs macvlan performance

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Date:	Tue, 04 Aug 2009 22:50:29 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Or Gerlitz <ogerlitz@...taire.com>
CC:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org,
	Vytautas Valancius <vytautas.valancius@...il.com>,
	Sapan Bhatia <sapanb@...princeton.edu>,
	virtualization@...ts.linux-foundation.org
Subject: Re: bridge vs macvlan performance

Or Gerlitz wrote:
> Ben Greear wrote:
>> Well, it seems we could and should fix veth to work, but it will have 
>> to do equivalent work of copying  an skb most likely, so either way 
>> you'll probably get a big performance hit.
> Using the same pktgen script (i.e with clone=0) I see that a 
> veth-->bridge-->veth configuration gives about 400K PPS forwarding 
> performance where macvlan-->veth-->macvlan gives 680K PPS (again, I 
> made sure that the bridge has applied learning before I start the 
> test). Basically, both the bridge and macvlan use hash on the 
> destination mac in order to know to which device forward the packet, 
> is there anything in the bridge logic that can explain the gap? It 
> there something which isn't really apples-to-apples in this comparison?
A VETH has to send to it's peer, so your descriptions are a bit vague.

What are you really configuring?  Maybe show us your script or commands 
that set up each of these tests?

Ben

>
> Or.
>
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-- 
Ben Greear <greearb@...delatech.com> 
Candela Technologies Inc  http://www.candelatech.com


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