From owner-freebsd-net@freebsd.org Wed Aug 14 00:27:16 2019 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id A4B0EC1DD1 for ; Wed, 14 Aug 2019 00:27:16 +0000 (UTC) (envelope-from jmg@gold.funkthat.com) Received: from gold.funkthat.com (gate2.funkthat.com [208.87.223.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "gate2.funkthat.com", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 467VlR59Byz4bV0 for ; Wed, 14 Aug 2019 00:27:15 +0000 (UTC) (envelope-from jmg@gold.funkthat.com) Received: from gold.funkthat.com (localhost [127.0.0.1]) by gold.funkthat.com (8.15.2/8.15.2) with ESMTPS id x7E0R5a4076654 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Tue, 13 Aug 2019 17:27:06 -0700 (PDT) (envelope-from jmg@gold.funkthat.com) Received: (from jmg@localhost) by gold.funkthat.com (8.15.2/8.15.2/Submit) id x7E0R5qE076653 for freebsd-net@freebsd.org; Tue, 13 Aug 2019 17:27:05 -0700 (PDT) (envelope-from jmg) Date: Tue, 13 Aug 2019 17:27:05 -0700 From: John-Mark Gurney To: freebsd-net@freebsd.org Subject: igb netstat input counters 2x? Message-ID: <20190814002705.GD2342@funkthat.com> Mail-Followup-To: freebsd-net@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Operating-System: FreeBSD 11.0-RELEASE-p7 amd64 X-PGP-Fingerprint: D87A 235F FB71 1F3F 55B7 ED9B D5FF 5A51 C0AC 3D65 X-Files: The truth is out there X-URL: https://www.funkthat.com/ X-Resume: https://www.funkthat.com/~jmg/resume.html X-TipJar: bitcoin:13Qmb6AeTgQecazTWph4XasEsP7nGRbAPE X-to-the-FBI-CIA-and-NSA: HI! HOW YA DOIN? can i haz chizburger? User-Agent: Mutt/1.6.1 (2016-04-27) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (gold.funkthat.com [127.0.0.1]); Tue, 13 Aug 2019 17:27:06 -0700 (PDT) X-Rspamd-Queue-Id: 467VlR59Byz4bV0 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of jmg@gold.funkthat.com designates 208.87.223.18 as permitted sender) smtp.mailfrom=jmg@gold.funkthat.com X-Spamd-Result: default: False [-2.42 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+a]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-0.998,0]; MIME_TRACE(0.00)[0:+]; NEURAL_HAM_SHORT(-0.86)[-0.855,0]; DMARC_NA(0.00)[funkthat.com]; IP_SCORE(-0.57)[ip: (-1.46), ipnet: 208.87.216.0/21(-0.73), asn: 32354(-0.58), country: US(-0.05)]; FORGED_SENDER(0.30)[jmg@funkthat.com,jmg@gold.funkthat.com]; R_DKIM_NA(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; ASN(0.00)[asn:32354, ipnet:208.87.216.0/21, country:US]; FROM_NEQ_ENVFROM(0.00)[jmg@funkthat.com,jmg@gold.funkthat.com]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Aug 2019 00:27:16 -0000 I'm doing some perf testing on an APU4 board, and I noticed that it looks like the input netstat counters are 2x than what they should be. I was seeing 60MiB/sec via netstat -w 1 -I igb1: 40034 0 0 60760352 2538 0 177909 0 40700 0 0 61776228 2574 0 180300 0 But the program was only reading 27MB/sec. I decided to read the mac stats directly via: bytes=$(sysctl -n dev.igb.1.mac_stats.good_octets_recvd); while sleep 1; do nbytes=$(sysctl -n dev.igb.1.mac_stats.good_octets_recvd) echo $(($nbytes - $bytes)); bytes=$nbytes done and saw much more reasonable numbers: 31099740 30512488 30675974 Which is more in line w/ the 27MB/sec that the program reports. I haven't looked at the code to see what could be causing the double counting. Also, the output numbers appear to be accurate. This is with 13.0-CURRENT from the July 25th snapshot, which is r350322. -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."