netdev - Re: Splice status

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Date:	Mon, 26 Jul 2010 22:37:52 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Ofer Heifetz <oferh@...vell.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	Changli Gao <xiaosuo@...il.com>, Jens Axboe <axboe@...nel.dk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Splice status

Ofer Heifetz wrote, On 25.07.2010 16:47:

> Hi Eric,
> 
> Still trying to get better performance with splice, I noticed that when using splice there are twice the file size memcpy (placed a counter in memcpy), I verified it via samba file transfer and splice-fromnet/out.
> 
> I also used the splice-fromnet/out and using ftrace I did notice that data is copied twice using these routines: skb_splice_bits, pipe_to_file.


I'm not sure you're using optimal NIC for splice, which should use
skbs with almost all data paged (non-linear), like niu or myri10ge.

Jarek P.
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