netdev - Re: UDP splice

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Message-ID: <1372098804.3301.77.camel@edumazet-glaptop>
Date:	Mon, 24 Jun 2013 11:33:24 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ricardo Landim <ricardolan@...il.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>, netdev@...r.kernel.org
Subject: Re: UDP splice

On Mon, 2013-06-24 at 15:08 -0300, Ricardo Landim wrote:
> Help in zero copy and improve in cost of syscalls.
> 
> In my intel xeon(3.3ghz), read udp socket and write udp socket (proxy)
> spends ~40000 cycles (~12 us).
> 

splice() wont reduce number of syscalls.

If payload is small, copying it is less than 1000 cycles, so its a small
part of the cost you measured.



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