linux-kernel - Re: [PATCH v15 00/17] Provide a zero-copy method on KVM virtio-net.

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Message-Id: <20101110.094641.193701683.davem@davemloft.net>
Date:	Wed, 10 Nov 2010 09:46:41 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	xiaohui.xin@...el.com
Cc:	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com, mingo@...e.hu,
	herbert@...dor.apana.org.au, jdike@...ux.intel.com
Subject: Re: [PATCH v15 00/17] Provide a zero-copy method on KVM virtio-net.

From: xiaohui.xin@...el.com
Date: Wed, 10 Nov 2010 17:23:28 +0800

> From: Xin Xiaohui <xiaohui.xin@...el.com>
> 
>>2) The idea to key off of skb->dev in skb_release_data() is
>>   fundamentally flawed since many actions can change skb->dev on you,
>>   which will end up causing a leak of your external data areas.
> 
> How about this one? If the destructor_arg is not a good candidate,
> then I have to add an apparent field in shinfo.

If destructor_arg is actually a net_device pointer or similar,
you will need to take a reference count on it or similar.

Which means --> good bye performance especially on SMP.

You're going to be adding new serialization points and at
least two new atomics per packet.
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