From owner-freebsd-net@freebsd.org Wed Jan 6 20:28:17 2016 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 80D64A6655D for ; Wed, 6 Jan 2016 20:28:17 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [78.47.246.247]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 1DB4414E6; Wed, 6 Jan 2016 20:28:16 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221]) by hz.grosbein.net (8.14.9/8.14.9) with ESMTP id u06KCeWG054234 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 6 Jan 2016 21:12:40 +0100 (CET) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: dchagin@freebsd.org Received: from [10.58.0.10] (dadvw [10.58.0.10]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id u06KCZoK015395 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Thu, 7 Jan 2016 03:12:35 +0700 (KRAT) (envelope-from eugen@grosbein.net) Subject: Re: long network segment call stack can fail To: Chagin Dmitry , freebsd-net@freebsd.org References: <20160106180008.GA1363@chd.heemeyer.club> From: Eugene Grosbein Message-ID: <568D752D.8090304@grosbein.net> Date: Thu, 7 Jan 2016 03:12:29 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 MIME-Version: 1.0 In-Reply-To: <20160106180008.GA1363@chd.heemeyer.club> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,LOCAL_FROM autolearn=no version=3.3.2 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.6 LOCAL_FROM From my domains X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on hz.grosbein.net X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.20 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, 06 Jan 2016 20:28:17 -0000 07.01.2016 1:00, Chagin Dmitry пишет: > Hi, all. > > Here's a panic that occurs during the massive network loads, > as far as I can see network segment has eaten the whole stack, so > only 0xeb0 bytes left for interrupt hanlder. For stable/10, sys/amd64/include/param.h defines KSTACK_PAGES=4 as default and GENERIC does not redefine it but NOTES gives example of increase upto 5. You could increase kernel thread size that way or switch to sysctl net.isr.dispatch=deferred so that input path just enqueues new frame and returns, freeing stack. Netisr kernel thread will take care of it later. Eugene Grosbein