netdev - What does socket option SO

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Message-ID: <20130430011112.GA1504@dvomlehn-z8.spacex.com>
Date:	Mon, 29 Apr 2013 18:11:12 -0700
From:	David VomLehn <David.VomLehn@...cex.com>
To:	<netdev@...r.kernel.org>
Subject: What does socket option SO_SNDBUF mean?

I've been asked how the socket option SO_SNDBUF should be used to avoid
blocking by writing too many bytes to a socket. This amounts to asking
how to interpret the SO_SNDBUF value. After looking through the networking
code for various kernel versions, it looks like the amount of overhead
included and how it is used is variable.

So:
1.	How *should* SO_SNDBUF be interpreted?
2.	Is it appropriate to use it to avoid blocking of socket writes?
3.	Does it have other uses besides giving a very fuzzy idea of
	socket writes will block?
-- 
David VL
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