From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Doug Graham" <dgraham@nortel.com>
Date: Thu, 30 Jul 2009 23:40:47 +0000
Subject: Re: [PATCH] Fix piggybacked ACKs
Message-Id: <20090730234047.GA2758@nortel.com>
MIME-Version: 1
Content-Type: multipart/mixed; boundary="Qxx1br4bt0+wmkIi"
List-Id: <linux-sctp.vger.kernel.org>
References: <20090729160557.GC29475@nortel.com>
In-Reply-To: <20090729160557.GC29475@nortel.com>
To: linux-sctp@vger.kernel.org


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On Thu, Jul 30, 2009 at 05:24:09PM -0400, Vlad Yasevich wrote:
> Doug Graham wrote:
> > On Thu, Jul 30, 2009 at 05:51:18PM +0800, Wei Yongjun wrote:
> >> The sender should create a SACK only if the size of the final SCTP
> >> packet does not exceed the current MTU. Base on RFC 4960:
> >>
> >>   6.1.  Transmission of DATA Chunks
> >>
> >>     Before an endpoint transmits a DATA chunk, if any received DATA
> >>     chunks have not been acknowledged (e.g., due to delayed ack), the
> >>     sender should create a SACK and bundle it with the outbound DATA
> >>     chunk, as long as the size of the final SCTP packet does not exceed
> >>     the current MTU.
> > 
> > [patch deleted]
> > 
> > I think you're right that there's a real problem here, and that a patch
> > similar to yours is needed, but this is not a new problem introduced
> > with my patch.  I only changed the conditions under which a SACK chunk
> > was bundled with a DATA chunk, but the same bundling would have been
> > happening before under different conditions.
> 
> Doug
> 
> If you still have BSD setup, can you try increasing you message size
> to say 1442 and see what happens.
> 
> I'd expect bundles SACKs at 1440 bytes, but then probably a separate SACK and DATA.

The largest amount of data I can send and still have the BSD server bundle
a SACK with the response is 1436 bytes.  The total ethernet frame size
at that point is 1514 bytes, so this seems correct.  I've attached
wireshark captures with data sizes of 1436 bytes and 1438 bytes.
It's interesting to note that if BSD decides not to bundle a SACK,
it instead sends a separate SACK packet immediately; it does not wait
for the SACK timer to timeout.  It first sends the SACK, then the DATA
immediately follows. I don't think Wei's patch would do this; I think
that if his patch determined that bundling a SACK would cause the packet
to exceed the MTU, then the behaviour will revert to what it was before
my patch is applied: ie the SACK will not be sent for 200ms.

So I guess the logic when about to send a DATA chunk should go something
like:

 if (sack_timer_running) {
   /* We know we owe the peer a SACK */
   if (SACK + DATA fits in the MTU)
      bundle SACK with DATA and send that
   else {
      send SACK in a separate packet
      send DATA in a separate packet
   }
   turn_off_sack_timer
 }

I don't think the RFC was explicit on what to do if the SACK+DATA
exceeds the MTU, but this makes sense to me.

--Doug.

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