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Date: Mon, 09 Jun 2014 09:15:02 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Per Hurtig <per.hurtig@....se> Cc: Nandita Dukkipati <nanditad@...gle.com>, Netdev <netdev@...r.kernel.org>, Anna Brunström <anna.brunstrom@....se>, mohammad.rajiullah@....se, Neal Cardwell <ncardwell@...gle.com>, Sergei Shtylyov <sergei.shtylyov@...entembedded.com> Subject: Re: [PATCH] tcp: fixing TLP's FIN recovery On Mon, 2014-06-09 at 17:56 +0200, Per Hurtig wrote: > > Ok, I guess you mean that the retransmission was not fast enough? But > will the same not happen if the original FIN is not lost and triggers a > SACK (i.e., if the two last data segments are still lost)? Yes, I'd like to understand why Nandita specifically added the original test. In her tests, fast retransmit was not really effective. Running packetdrill in a separate container gives me these interesting counters : # nstat #kernel IpInReceives 4 0.0 IpInDelivers 4 0.0 IpOutRequests 5 0.0 TcpPassiveOpens 1 0.0 TcpInSegs 4 0.0 TcpOutSegs 10 0.0 TcpRetransSegs 2 0.0 TcpExtTCPPureAcks 3 0.0 TcpExtTCPSackRecovery 1 0.0 TcpExtTCPFastRetrans 1 0.0 TcpExtTCPLossProbes 1 0.0 TcpExtTCPSackRecoveryFail 1 0.0 TcpExtTCPSackShiftFallback 1 0.0 TcpExtTCPRetransFail 4 0.0 <<<< HERE >>> TcpExtTCPOrigDataSent 9 0.0 IpExtInOctets 184 0.0 IpExtOutOctets 9212 0.0 IpExtInNoECTPkts 4 0.0 I guess we need to understand why the retransmit is in error. I am investigating. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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