netdev - RE: [Lksctp-developers] Fw: Intermittent SCTP multihoming breakage

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Message-ID: <E096369D937D3A4DB271B382850C5C5F44E657@pysmail.eicon.com>
Date:	Mon, 5 Feb 2007 11:53:42 -0500
From:	"Steve Hill" <steve.hill@...logic.com>
To:	"Vlad Yasevich" <vladislav.yasevich@...com>
Cc:	<netdev@...r.kernel.org>,
	<lksctp-developers@...ts.sourceforge.net>,
	"Sridhar Samudrala" <sri@...ibm.com>
Subject: RE: [Lksctp-developers] Fw: Intermittent SCTP multihoming breakage

Vlad Yasevich wrote on 05 February 2007 16:39:

> Once you start simulating the network failure, how long do you wait?
> 
> If you have not changed rto_max and path_max_retrans, you can end up
> waiting quite a while for the full path switchover.  This will also
> severely slow down your retransmissions...

I'm waiting several minutes, and I'm using setsockopt() to set the
timeouts fairly low:
	srto_initial = 1000ms
	srto_min = 200ms
	srto_max = 1400ms
	spp_pathmaxrxt = 2
	spp_hbinterval = 1000ms

The network's round trip time (indicated by ping) is on the order of
<0.25ms.

 - Steve Hill
   Software Engineer
   Dialogic
   Fordingbridge, Hampshire, UK
   +44-1425-651392
   steve.hill@...logic.com
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