netdev - Re: kernel panic in skb_copy

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Message-Id: <20130704.143246.1946946036139459725.davem@davemloft.net>
Date:	Thu, 04 Jul 2013 14:32:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	Ian.Campbell@...rix.com, joe.jin@...cle.com, alex@...x.org.uk,
	frank.blaschka@...ibm.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, zheng.x.li@...cle.com,
	xen-devel@...ts.xen.org, JBeulich@...e.com,
	stefano.stabellini@...citrix.com, konrad.wilk@...cle.com
Subject: Re: kernel panic in skb_copy_bits

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 04 Jul 2013 03:12:10 -0700

> It looks like a typical COW issue to me.

Generically speaking, if we have to mess with page protections this
eliminates the performance gain from bypass/zerocopy/whatever that
these virtualization layers are doing.

But there may be other factors involved which might mitigate that.
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