Date: Thu, 25 Feb 2021 04:50:10 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 253836] ifconfig reports 2x actual received bytes with em / igb Message-ID: <bug-253836-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D253836 Bug ID: 253836 Summary: ifconfig reports 2x actual received bytes with em / igb Product: Base System Version: 13.0-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: eborisch+FreeBSD@gmail.com As reported here: https://lists.freebsd.org/pipermail/freebsd-stable/2021-February/093170.html and now reproduced on a Thinkpad X230, on 13.0-BETA3: Isssue: ifconfig reports 2x the received bytes compared to what is reported= via dev.(igb|em).<n>.mac_stats.good_octets_recvd. The octets_recvd count lines = (~) up with the expected count based on known traffic. This is new on 13. Copy of my original report to the mailing list: The incoming bytes on an intel I211 (em/igb) are being counted twice somewhere in the path that is queried by netstat and zabbix_agentd (which definitely uses ifmib.) My 'cable' interface is dev.igb.0; the system is live, so counts are going to keep going up, too. $ sysctl dev.igb.0 | grep octet dev.igb.0.mac_stats.good_octets_txd: 4836948514 dev.igb.0.mac_stats.good_octets_recvd: 17402549118 $ netstat -I cable -b | column -t Name Mtu Network Address Ipkts Ierrs Idrop Ibytes Opkts Oerrs Obytes Coll cable 1500 <Link#1> 00:0d:b9:55:70:08 31197172 0 0 34681776974 9401856 0 4793050336 0 cable - 199.48.95.0/2 1500922-static.ro 94275 - - 24989369 106396 - 9906685 - $ zabbix_agentd -t 'net.if.in[cable]' net.if.in[cable] [u|34684619970] Note the octets_txd (which should be a little bigger than obytes) is very close to netstat's Obytes (obytes): 4836948514 ~=3D 4793050336 But octets_recvd (which should be a little bigger than ibytes) is ~ 1/2 of netstat/zabbix's (ifmib's) ibytes. 17402549118 ~=3D 34681776974 / 2 I can run known traffic across an interface, and the octets_recvd are hanging with the expected change, while netstat's and zabbix's are at 2x. I'm running a custom kernel, but I was running the same on 12.2, as well, and this only crept up on 13. I don't have 13 running on anything with different hardware to compare, unfortunately. --=20 You are receiving this mail because: You are the assignee for the bug.=
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