netdev - Re: [PATCH] sendfile() and UDP socket

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Message-ID: <20080922002153.GC1878@2ka.mipt.ru>
Date:	Mon, 22 Sep 2008 04:21:57 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	David Miller <davem@...emloft.net>
Cc:	johaahn@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] sendfile() and UDP socket

On Sun, Sep 21, 2008 at 01:04:58AM -0700, David Miller (davem@...emloft.net) wrote:
> Applications which work over datagram protocols must perform their own
> segmentation.  It is not like doing a send over a stream protocol like
> TCP, where you can use whatever length you want for send calls and
> segmentation is done for the application.

But isn't the whole idea of the sendfile() is to send a file no matter
what underlying media is?

> If you look, this is what things like NFS using SUNRPC over UDP do.
> They have a transmission unit for the data transfer and use that for
> each "send".

That's maybe because udp_sendpage() does not support sending pending
data if new packet is too big to attach?

-- 
	Evgeniy Polyakov
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