linux-kernel - Re: [RFC] [TCP 1/3] tcp: Add MSG_NEW_PACKET flag to indicate preferable packet boundaries

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Message-ID: <1340990157.21162.5.camel@edumazet-glaptop>
Date:	Fri, 29 Jun 2012 19:15:57 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andreas Gruenbacher <agruen@...bit.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC] [TCP 1/3] tcp: Add MSG_NEW_PACKET flag to indicate
 preferable packet boundaries

On Fri, 2012-06-29 at 17:38 +0200, Andreas Gruenbacher wrote:

> The primary use case is fast Gigabit (10 or more) Ethernet connections
> with jumbo frames and switches that support them.  There, frames will go
> through unchanged and you can zero-copy receive all the time.
> 
> Not sure how well the approach scales to other kinds of connections; it
> may work often enough to be worth it.  When things get distorted between
> the sender and the receiver and tcp_recvbio() fails, the data can still
> be copied out of the socket as before.

If you have a packet loss, receiver can and will coalesce frames.


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