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Date:	Fri, 11 Apr 2014 09:17:28 -0700
From:	Ben Greear <>
To:	Herbert Xu <>
CC:	Eric Dumazet <>,
	David Miller <>,
Subject: Re: [PATCH 2/2] macvlan: Move broadcasts into a work queue

On 04/10/2014 07:13 PM, Herbert Xu wrote:
> On Thu, Apr 10, 2014 at 07:09:30PM -0700, Eric Dumazet wrote:
>> On Fri, 2014-04-11 at 09:59 +0800, Herbert Xu wrote:
>>> On Thu, Apr 10, 2014 at 09:40:23PM -0400, David Miller wrote:
>>>> From: Herbert Xu <>
>>>> Date: Wed, 9 Apr 2014 01:23:49 +0800
>>>>> On Tue, Apr 08, 2014 at 09:48:40AM -0700, Ben Greear wrote:
>>>>>> At least for ARPs, maybe we could inspect the packet and only
>>>>>> deliver to interfaces configured with the MAC that is being
>>>>>> ARPed for (or ones that are in promisc)?
>>>>> Yes this would definitely be a great optimisation.
>>>> Yes and you can use the direct rather than the workqueue path.
>>> This would be a worthy optimisation for bridge.c too.  In fact,
>>> I wonder if it would be possible to share some of the broadcast/
>>> multicast logic between macvlan and bridge.
>> But many ARP messages are broadcasted, particularly when you restart
>> an hypervisor with thousand of macvlan. This is the moment we have
>> this horrible quadratic behavior in macvlan.
>> I do not understand the idea...
>> ARP filter would require to inspect the queried IPv4 address, and
>> macvlan do not currently have a list of IPv4 addresses per port.
> Indeed.  Thanks for snapping us out of our collective daydream :)

arp-filter can already do this, so you could just re-use that
behaviour, I think?


Ben Greear <>
Candela Technologies Inc

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