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

From: Stephen Hemminger <[email-masked]>
Date: Sat, 11 Aug 2012 13:55:56 -0700

On Fri, 10 Aug 2012 11:34:32 +0800
"Peter Huang(Peng)" <[email-masked]> 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.