linux-kernel - Re: UDP packets loss

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Message-Id: <20061116.162320.28787779.davem@davemloft.net>
Date:	Thu, 16 Nov 2006 16:23:20 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eli@....mellanox.co.il
Cc:	jheffner@....edu, linux-kernel@...r.kernel.org,
	linux-net@...r.kernel.org
Subject: Re: UDP packets loss

From: eli@....mellanox.co.il
Date: Thu, 16 Nov 2006 23:10:08 +0200 (IST)

> >
> > BTW, TCP will be significantly faster than UDP because with UDP you
> > incur an extra full context switch on every packet.
> >
> 
> Could you elaborate on this a bit more? What kind of context switch?

TCP queues and takes care of all the sending, packetization,
etc. handling asynchronously.  Whereas with UDP every write()
results in a packet on the wire, packets are always emitted
synchronously in process context.

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