From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vlad Yasevich Date: Mon, 22 Feb 2010 19:42:29 +0000 Subject: Re: Fast Retransmission Settings Message-Id: <4B82DE25.8070103@hp.com> List-Id: References: <4620668FFAA3D5458A691287D9DDAD11071917E6@zrtphxm2.corp.nortel.com> In-Reply-To: <4620668FFAA3D5458A691287D9DDAD11071917E6@zrtphxm2.corp.nortel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-sctp@vger.kernel.org Brandon Moreno wrote: > Hi, > > I have a general question about lksctp's fast retransmit implementation. > > > I am currently using lksctp-tools-1.0.6-1.i386.rpm on my server side. > After setting up an sctp connection, I am seeing proper messaging while > we run various messages over the SCTP stream. The issue that I am seeing > is when a packet is lost in the network. Presently, when a TSN is lost > on our client side, it starts transmitting sack messages with gap > reports. The server side is receiving the gap sack messages, however it > is not retransmitting the packet until the rto timer expires. Since the > rto timer increases, eventually the whole sctp association is going down > when too many gap reports are received without a retransmission. > > I am curious why we are not seeing fast retransmit after 4 gap reports > are received. Is there some setting that will affect fast retransmit > being on or off? No, but there might be a bug in the kernel you are using. Which kernel version are you using on the server? -vlad > > Thanks, > Brandon Moreno > Ericsson BCAM > (972)684-1791 esn x444-1791 > > The author works for Telefonaktiebolaget L M Ericsson ("Ericsson"), who > is solely responsible for this email and its contents. All inquiries > regarding this email should be addressed to Ericsson. Nortel has > provided the use of the nortel.com domain to Ericsson in connection with > this email solely for the purpose of connectivity and Nortel Networks > has no liability for the email or its contents. The web site for > Ericsson is www.ericsson.com ." > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-sctp" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >