From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org
Subject: [Bug 35852] SO_PRIORITY does not set TOS field in IP header
Date: Tue, 05 May 2015 19:24:28 +0000
Message-ID: <bug-35852-11311-D2jjKsMZ8s@https.bugzilla.kernel.org/>
References: <bug-35852-11311@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=35852

Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         Resolution|---                         |CODE_FIX

--- Comment #2 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(In reply to advaitdixit from comment #0)
> The socket man page says that setsockopt with level=SOL_SOCKET  and
> optname=SO_PRIORITY sets the TOS field in IP header:
> http://www.kernel.org/doc/man-pages/online/pages/man7/socket.7.html
> 
> However, my experiments and other web search results suggest that the socket
> man page is wrong. SO_PRIORITY does not seem to set the TOS field in the IP
> header.

A quick scan of the kernel source also finds nothing to suggest that
SO_PRIORITY sets the TOS field in the IP header.

Various URLs question this text in teh man page
http://mailman.isi.edu/pipermail/ns-developers/2012-September/010638.html
https://athena.ecs.csus.edu/~bransone/pub/misc/netfilter_notes/qos
https://ocrete.ca/2009/07/24/when-a-man-page-lies/
http://lkml.iu.edu/hypermail/linux/net/0512.3/0008.html

So, I'll remove this text from socket(7) (and also similar text in ip(7)), and
close this bug.

Thanks.

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