[Bug 35852] New: SO_PRIORITY does not set TOS field in IP header

[Bug 35852] New: SO_PRIORITY does not set TOS field in IP header

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=35852

               URL: http://www.kernel.org/doc/man-pages/online/pages/man7/
                    socket.7.html
           Summary: SO_PRIORITY does not set TOS field in IP header
           Product: Documentation
           Version: unspecified
    Kernel Version: n/a
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
        AssignedTo: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
        ReportedBy: advaitdixit-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org
        Regression: No


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.

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[Bug 35852] SO_PRIORITY does not set TOS field in IP header

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=35852

xerofoify-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |xerofoify-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

--- Comment #1 from xerofoify-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org ---
This bug is against a old man pages. Please check with a newer verison.
Nick

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[Bug 35852] SO_PRIORITY does not set TOS field in IP header

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

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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[Bug 35852] SO_PRIORITY does not set TOS field in IP header

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=35852

--- Comment #3 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
And one more URL that questioned the effect of SO_PRIORITY on IP TOS:

http://thread.gmane.org/gmane.linux.man/2074

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