Date: Wed, 15 Dec 2021 04:55:19 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 260427] [regression]: netmap causes packet drops Message-ID: <bug-260427-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D260427 Bug ID: 260427 Summary: [regression]: netmap causes packet drops Product: Base System Version: 12.2-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: emz@norma.perm.ru Env: FreeBSD 12.2-RELEASE which was previously running 11.x and 10.x Input flow from Catalyst 2960 around 30-300 Mbit/sec, media 1000baseT Hardware: IBM System x3250 m2 Hardware interfaces: bge(4) NetXtreme BCM5722 Gigabit Ethernet PCI Express em(4) 82572EI Gigabit Ethernet Controller (Copper) First the input flow was directd via onboard bge(4), port no.1. Around seve= ral months ago we noticed high error rate reflecting in netstat input errors and hardware dev.bge.0 counters like=20 dev.bge.0.stats.InputDiscards Error input rate was changing from 0 (most of the time) to 6K-80K per secon= d. Recovery measures (that didn't help, each step): - changed the patch cable from catalyst - changed the onboard port from 1 to 0 - started to suspect the onboeard ethernet controller, added the Intel Pro/= 1000 MT external adapter via the riser card, error rate migrated into the dev.em.0.mac_stats.missed_packets counter, sometimes triggering the dev.em.0.mac_stats.recv_no_buff: dev.em.0.mac_stats.recv_no_buff: 9424 dev.em.0.mac_stats.missed_packets: 1853592 - added the iflib/netmap tuning: net.isr.numthreads=3D"2" net.isr.maxthreads=3D"2" dev.em.0.iflib.rx_budget=3D"65535" dev.em.0.iflib.override_nrxds=3D"4096" dev.em.0.iflib.override_ntxds=3D"4096" dev.em.0.iflib.disable_msix=3D"0" - added the interrupt moderation dev.em.0.rx_int_delay=3D"200" dev.em.0.tx_int_delay=3D"200" dev.em.0.rx_abs_int_delay=3D"4000" dev.em.0.tx_abs_int_delay=3D"4000" - tried to play with the kern.eventtimer kern.eventtimer.periodic=3D"1" Steps that did help: - decided to try the Intel em(4) module from ports, that doesn't wotk with netmap and requires kernel built without em(4) support. Added the "nodevice= em" and "nodevice netmap" config lines, rebuilt the kernel, installed it and rebooted (still with the stock driver at this time, just to switch to the loadable module). Errors magically stopped. --=20 You are receiving this mail because: You are the assignee for the bug.=
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