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Message-ID: <1340982666.21162.3.camel@edumazet-glaptop> Date: Fri, 29 Jun 2012 17:11:06 +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 16:54 +0200, Andreas Gruenbacher wrote: > The MSG_NEW_PACKET flag indicates to sendmsg / sendpage that the message or > page should be put into a new packet even when there is still room left in the > previous packet. > > In the tcp protocol, messages which are not sent immediately are queued. When > more data is sent, it will be added to the last segment in that queue until > that segment is "full" whenever possible; only then is a new segment added. > Right now, there is no way to indicate when tcp should start a new segment. > The new flag allows to control that. > > Signed-off-by: Andreas Gruenbacher <agruen@...bit.com> > --- I don't understand how maintaining any message boundaries at sender can prevent any middlebox or the receiver to coalesce frames to any boundaries it prefers ? -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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