From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail2.candelatech.com ([208.74.158.173]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZiVa5-0000EO-9d for ath10k@lists.infradead.org; Sat, 03 Oct 2015 22:47:05 +0000 Message-ID: <56105AD2.7070906@candelatech.com> Date: Sat, 03 Oct 2015 15:46:42 -0700 From: Ben Greear MIME-Version: 1.0 Subject: Re: Slow ramp-up for single-stream TCP throughput on 4.2 kernel. References: <560F1672.5000602@candelatech.com> <560F1F74.9010207@candelatech.com> In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "ath10k" Errors-To: ath10k-bounces+kvalo=adurom.com@lists.infradead.org To: Neal Cardwell Cc: netdev , ath10k On 10/03/2015 09:29 AM, Neal Cardwell wrote: > On Fri, Oct 2, 2015 at 8:21 PM, Ben Greear 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@ben-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@ben-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 Candela Technologies Inc http://www.candelatech.com _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k