netdev - Re: tainted warnings with tcp splicing in 3.7.1

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Date:	Thu, 10 Jan 2013 10:22:21 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Willy Tarreau <w@....eu>,
	Christian Becker <c.becker@...viangames.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: tainted warnings with tcp splicing in 3.7.1

On 01/10/2013 08:20 AM, Eric Dumazet wrote:
> I also want to thanks Rick, as the latest netperf has splice() support.
>
> Thanks Rick !

You are quite welcome - and thank you for helping me get it to actually 
work :)

Those wishing to try it themselves should grab the top-of-trunk netperf 
bits from http://www.netperf.org/svn/netperf2/trunk .  The use of 
splice() is gated by a test-specific -V option:

raj@...dy:~/netperf2_trunk/src$ ./netperf -t omni -- -d recv -V
OMNI Receive TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 
localhost.localdomain () port 0 AF_INET : copy avoidance : demo
Remote      Local       Remote Elapsed Throughput Throughput
Send Socket Recv Socket Send   Time               Units
Size        Size        Size   (sec)
Final       Final
1661688     4194304     16384  10.00   26103.14   10^6bits/s

You should see that "copy avoidance" appearing in the test banner.  It 
will also "take" for things like a migrated TCP_mumble test.  For those 
cases where you don't see a throughput change, enabling CPU utilization 
measurement and looking at that and service demand should show a difference.

happy benchmarking,

rick jones
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