netdev - Re: zero copy for relay server

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Message-ID: <1301408017.3161.154.camel@edumazet-laptop>
Date:	Tue, 29 Mar 2011 16:13:37 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Viral Mehta <Viral.Mehta@...infotech.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: zero copy for relay server

Le mardi 29 mars 2011 à 19:28 +0800, Changli Gao a écrit :

> It is a waste of fd using pipe buffer with two fds. In fact, I had
> ever posted a patch, which extends pipe(2) to return a O_RDWR fd when
> NULL is passed in.
> 

Oh well, one extra fd is less than 256 bytes.

Adding a syscall means you force users to have latest kernel.

All this is hypothetical, nobody gave performance numbers demonstrating
splice()/splice() is slow enough we have to optimize it and add kernel
bloat...



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