netdev - Re: [Bugme-new] [Bug 12860] New: SO_RCVBUF and SO_SNDBUF must be set before connect() or listen()

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Message-Id: <20090312131306.260cf3ff.akpm@linux-foundation.org>
Date:	Thu, 12 Mar 2009 13:13:06 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	bugme-daemon@...zilla.kernel.org, cristiklein@...il.com
Subject: Re: [Bugme-new] [Bug 12860] New: SO_RCVBUF and SO_SNDBUF must be
 set before connect() or listen()


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Thu, 12 Mar 2009 10:23:52 -0700 (PDT)
bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=12860
> 
>            Summary: SO_RCVBUF and SO_SNDBUF must be set before connect() or
>                     listen()
>            Product: Networking
>            Version: 2.5
>      KernelVersion: 2.6.18
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: IPV4
>         AssignedTo: shemminger@...ux-foundation.org
>         ReportedBy: cristiklein@...il.com
> 
> 
> Problem Description:
> 
> Calling setsockopt() with SO_RCVBUF or SO_SNDBUF after connect() or listen()
> makes sockets have a horrible performance. Moreover, getsockopt() returns
> values as if the previous setsockopt() was successful.
> 
> Solution:
> 
> 1) Document this somewhere in the man-pages (e.g. socket(7))
> 2) Make setsockopt() fail after connect() or listen()
> 
> If you need an example code, I'll be happy to provide it.
> 

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