From owner-freebsd-net@freebsd.org Sun Nov 11 23:38:19 2018 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 23ECB11297E2 for ; Sun, 11 Nov 2018 23:38:19 +0000 (UTC) (envelope-from wolfgang@lyxys.ka.sub.org) Received: from saturn.lyxys.ka.sub.org (saturn.lyxys.ka.sub.org [217.29.35.151]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 370BD74323 for ; Sun, 11 Nov 2018 23:38:10 +0000 (UTC) (envelope-from wolfgang@lyxys.ka.sub.org) Received: from juno.lyxys.ka.sub.org (juno.lyx [IPv6:fd2a:89ca:7d54:0:240:caff:fe92:4f47]) by saturn.lyxys.ka.sub.org (8.15.2/8.15.2) with ESMTPS id wABNNLrC001364 (version=TLSv1 cipher=DHE-RSA-AES128-SHA bits=128 verify=FAIL) for ; Mon, 12 Nov 2018 00:23:23 +0100 (CET) (envelope-from wolfgang@lyxys.ka.sub.org) Received: from juno.lyxys.ka.sub.org (localhost [127.0.0.1]) by juno.lyxys.ka.sub.org (8.15.2/8.15.2) with ESMTPS id wABNNLJ1096094 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Mon, 12 Nov 2018 00:23:21 +0100 (CET) (envelope-from wolfgang@lyxys.ka.sub.org) Received: (from wolfgang@localhost) by juno.lyxys.ka.sub.org (8.15.2/8.15.2/Submit) id wABNNL7U096091 for freebsd-net@freebsd.org; Mon, 12 Nov 2018 00:23:21 +0100 (CET) (envelope-from wolfgang@lyxys.ka.sub.org) X-Authentication-Warning: juno.lyx: wolfgang set sender to wolfgang@lyxys.ka.sub.org using -f Date: Mon, 12 Nov 2018 00:23:21 +0100 From: Wolfgang Zenker To: freebsd-net@freebsd.org Subject: epair(4) and net.route.netisr_maxqlen Message-ID: <20181111232320.GA87730@lyxys.ka.sub.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Organization: private site User-Agent: Mutt/1.10.1 (2018-07-13) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.4.3 (saturn.lyxys.ka.sub.org [IPv6:fd2a:89ca:7d54:1:200:24ff:feca:b4cc]); Mon, 12 Nov 2018 00:23:23 +0100 (CET) X-Rspamd-Queue-Id: 370BD74323 X-Spamd-Result: default: False [-2.21 / 200.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.98)[-0.984,0]; NEURAL_HAM_LONG(-0.99)[-0.985,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; HAS_XAW(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; HAS_ORG_HEADER(0.00)[]; RCVD_COUNT_THREE(0.00)[4]; TO_DN_NONE(0.00)[]; NEURAL_SPAM_SHORT(0.07)[0.069,0]; MX_GOOD(-0.01)[subnet.sub.net,mailin.pluspunkthosting.de,saturn.lyxys.ka.sub.org,subnet.sub.net,mailin.pluspunkthosting.de,saturn.lyxys.ka.sub.org]; DMARC_NA(0.00)[sub.org]; IP_SCORE(-0.00)[country: DE(-0.01)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:16188, ipnet:217.29.32.0/20, country:DE]; MID_RHS_MATCH_FROM(0.00)[] X-Rspamd-Server: mx1.freebsd.org 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: Sun, 11 Nov 2018 23:38:19 -0000 Hi, on a jail with quite a lot of somewhat bursty network traffic I get warnings from netdata recently about packets being dropped because of net.route.netisr_maxqlen being to small. Before I start setting this value to some random value I'ld like to find out what it actually means. A search for documentation turned up nothing; a look at the sources found that it is used for the size of a "software interrupt queue" in epair(4). But what does it mean? And does this give me enough information to find a good value to set for this sysctl? Wolfgang