netdev - Re: [RFC PATCH 00/17] virtual-bus

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Date:	Thu, 02 Apr 2009 07:06:07 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Herbert Xu <herbert@...dor.apana.org.au>, anthony@...emonkey.ws,
	andi@...stfloor.org, linux-kernel@...r.kernel.org, agraf@...e.de,
	pmullaney@...ell.com, pmorreale@...ell.com, rusty@...tcorp.com.au,
	netdev@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH 00/17] virtual-bus

Avi Kivity wrote:
> Herbert Xu wrote:
>> On Thu, Apr 02, 2009 at 12:27:17PM +0300, Avi Kivity wrote:
>>  
>>> If tap told us when the packets were actually transmitted, life
>>> would be  wonderful:
>>>     
>>
>> And why do we need this? Because we are in user space!
>>
>>   
>
> Why does a kernel solution not need to know when a packet is transmitted?
>

You do not need to know when the packet is copied (which I currently
do).  You only need it for zero-copy (of which I would like to support,
but as I understand it there are problems with the reliability of proper
callback (i.e. skb->destructor).

Its "fire and forget" :)

-Greg


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