netdev - Re: [Question]About KVM network zero-copy feature!

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Message-ID: <20120811135556.58ddf48d@nehalam.linuxnetplumber.net>
Date:	Sat, 11 Aug 2012 13:55:56 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	"Peter Huang(Peng)" <peter.huangpeng@...wei.com>
Cc:	<kvm@...r.kernel.org>, <avi@...hat.com>, <mtosatti@...hat.com>,
	<mst@...hat.com>, <virtualization@...ts.linux-foundation.org>,
	<netdev@...r.kernel.org>
Subject: Re: [Question]About KVM network zero-copy  feature!

On Fri, 10 Aug 2012 11:34:32 +0800
"Peter Huang(Peng)" <peter.huangpeng@...wei.com> wrote:

> Hi,All
> 
> I searched from git-log, and found that until now we have vhost TX zero-copy experiment feature, how
> about RX zero-copy?
> 
> For XEN, net-back also only has TX zero-copy, Is there any reason that RX zero-copy still not implemented?
> 
There is no guarantee that packet will ever be read by receiver. This means zero-copy could
create memory back pressure stalls.
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