netdev - Re: [PATCH net-next 3/6] net: Add MSG

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Message-Id: <1448272941.3985012.447402329.73885F37@webmail.messagingengine.com>
Date:	Mon, 23 Nov 2015 11:02:21 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Tom Herbert <tom@...bertland.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Cc:	kernel-team@...com, davewatson@...com, alexei.starovoitov@...il.com
Subject: Re: [PATCH net-next 3/6] net: Add MSG_BATCH flag

Hello,

On Fri, Nov 20, 2015, at 22:21, Tom Herbert wrote:
> Add a new msg flag called MSG_BATCH. This flag is used in sendmsg to
> indicate that more messages will follow (i.e. a batch of messages is
> being sent). This is similar to MSG_MORE except that the following
> messages are not merged into one packet, they are sent individually.
> 
> MSG_BATCH is a performance optimization in cases where a socket
> implementation can benefit by transmitting packets in a batch.
> 
> This patch also updates sendmmsg so that each contained message except
> for the last one is marked as MSG_BATCH.

This flag is only used for KCM because it does not make sense to expose
it to user space? As such, could this be made more clear? I don't see
such an optimization being needed for UDP or TCP.

Thanks,
Hannes
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