netdev - Re: [PATCH RFC 1/6] skbuff: support per-page destructors in copy

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Message-ID: <20120511120836.GA4637@redhat.com>
Date:	Fri, 11 May 2012 15:08:37 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>
Subject: Re: [PATCH RFC 1/6] skbuff: support per-page destructors in
 copy_ubufs

On Fri, May 11, 2012 at 11:58:12AM +0100, Ian Campbell wrote:
> On Fri, 2012-05-11 at 10:00 +0100, Ian Campbell wrote:
> > I'm seeing copy_ubufs called in my remote NFS test, which I don't
> > think I expected -- I'll investigate why this is happening today. 
> 
> It's tcp_transmit_skb which can (conditionally) call skb_clone
> (backtrace below)

Interesting. I didn't realise we clone skbs on data path:
tcp_write_xmit calls tcp_transmit_skb with clone_it flag.
Could someone comment on why we need to clone on good path
like this?

-- 
MST
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