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Date: Sat, 03 Oct 2015 15:46:42 -0700 From: Ben Greear <greearb@...delatech.com> To: Neal Cardwell <ncardwell@...gle.com> CC: netdev <netdev@...r.kernel.org>, ath10k <ath10k@...ts.infradead.org> Subject: Re: Slow ramp-up for single-stream TCP throughput on 4.2 kernel. On 10/03/2015 09:29 AM, Neal Cardwell wrote: > On Fri, Oct 2, 2015 at 8:21 PM, Ben Greear <greearb@...delatech.com> wrote: >> Gah, seems 'cubic' related. That is the default tcp cong ctrl >> I was using (same in 3.17, for that matter). > > There have been recent changes to CUBIC that may account for this. If > you could repeat your test with more instrumentation, eg "nstat", that > would be very helpful. > > nstat > /dev/null > # run one test > nstat > > Also, if you could take a sender-side tcpdump trace of the test, that > would be very useful (default capture length, grabbing just headers, > is fine). Here is nstat output: [root@...-ota-1 ~]# nstat #kernel IpInReceives 14507 0.0 IpInDelivers 14507 0.0 IpOutRequests 49531 0.0 TcpActiveOpens 3 0.0 TcpPassiveOpens 2 0.0 TcpInSegs 14498 0.0 TcpOutSegs 50269 0.0 UdpInDatagrams 9 0.0 UdpOutDatagrams 1 0.0 TcpExtDelayedACKs 43 0.0 TcpExtDelayedACKLost 5 0.0 TcpExtTCPHPHits 483 0.0 TcpExtTCPPureAcks 918 0.0 TcpExtTCPHPAcks 12758 0.0 TcpExtTCPDSACKOldSent 5 0.0 TcpExtTCPRcvCoalesce 49 0.0 TcpExtTCPAutoCorking 3 0.0 TcpExtTCPOrigDataSent 49776 0.0 TcpExtTCPHystartTrainDetect 1 0.0 TcpExtTCPHystartTrainCwnd 16 0.0 IpExtInBcastPkts 8 0.0 IpExtInOctets 2934274 0.0 IpExtOutOctets 74817312 0.0 IpExtInBcastOctets 640 0.0 IpExtInNoECTPkts 14911 0.0 [root@...-ota-1 ~]# And, you can find the pcap here: http://www.candelatech.com/downloads/cubic.pcap.bz2 Let me know if you need anything else. Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com -- 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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