Re: path of packets through network stack

From	Rainer Weikusat <rweikusat@mssgmbh.com>
Newsgroups	comp.os.linux.embedded, comp.unix.programmer
Subject	Re: path of packets through network stack
Date	2012-11-15 16:12 +0000
Message-ID	<87vcd6q1yt.fsf@sapphire.mobileactivedefense.com> (permalink)
References	<k7m2i1$7ul$1@speranza.aioe.org> <87sj8e234t.fsf@sapphire.mobileactivedefense.com> <k80atc$1b2$1@speranza.aioe.org>

Cross-posted to 2 groups.

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"Mark" <mark_cruzNOTFORSPAM@hotmail.com> writes:
> "Rainer Weikusat" <rweikusat@mssgmbh.com> wrote in message 
>
> [skip]
>>> Now, I'm sending a single packet and observe that I'm getting printk form
>>> inet_sendmsg() twice.This puzzles me -- is it normal (has something to do
>>> with interrupts etc. ?) or there's something broken in the kernel?
>>
>> Presumably, the phenomenon you observed is 'normal' and it is
>> certainly not related to 'interrupts'.
>
> Could you elaborate on why you believe this phenomenon is normal ?

Considering the following possible explanations:

	- you found an unknown, major kernel error in the interface
          parts of the networking stack which can be triggered in an
          extremely simple way

	- your code doesn't really do what you think it does

        - this is either coincidence or part of the 'normal'
          processing but the exact reason for it is unknown

the first seems the least likely to me. This doesn't mean that I'm
necessarily right but I'm not going to investigate this phenomenon in
the kernels I'm responsible for because I'm afraid that it could be
something serious which could affect other stuff I'm also responsible
for in some negative way.

BTW: You aren't per chance doing this on a system you're acessing over
the network?

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Thread

path of packets through network stack "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-11-10 12:23 -0500
  Re: path of packets through network stack Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-11-12 16:32 +0000
    Re: path of packets through network stack "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-11-13 08:31 -0500
      Re: path of packets through network stack Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-11-13 14:29 +0000
    Re: path of packets through network stack "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-11-14 09:41 -0500
      Re: path of packets through network stack Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-11-15 16:12 +0000
  Re: path of packets through network stack Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2012-11-12 20:22 +0200
    Re: path of packets through network stack "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-11-13 08:34 -0500
  Re: path of packets through network stack Rick Jones <rick.jones2@hp.com> - 2012-11-13 01:34 +0000

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