From owner-freebsd-net@freebsd.org Sat Jan 9 07:58:49 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 5FA37A672B4 for ; Sat, 9 Jan 2016 07:58:49 +0000 (UTC) (envelope-from dchagin@chd.heemeyer.club) Received: from heemeyer.club (heemeyer.club [108.61.204.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "heemeyer.club", Issuer "heemeyer.club" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 3AF941E41; Sat, 9 Jan 2016 07:58:48 +0000 (UTC) (envelope-from dchagin@chd.heemeyer.club) Received: from chd.heemeyer.club ([78.107.232.239]) by heemeyer.club (8.15.2/8.15.1) with ESMTPS id u097wcKF030792 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 9 Jan 2016 07:58:40 GMT (envelope-from dchagin@chd.heemeyer.club) X-Authentication-Warning: heemeyer.club: Host [78.107.232.239] claimed to be chd.heemeyer.club Received: from chd.heemeyer.club (localhost [127.0.0.1]) by chd.heemeyer.club (8.15.2/8.15.1) with ESMTPS id u097wbKp004118 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Sat, 9 Jan 2016 10:58:38 +0300 (MSK) (envelope-from dchagin@chd.heemeyer.club) Received: (from dchagin@localhost) by chd.heemeyer.club (8.15.2/8.15.1/Submit) id u097wbX5004117; Sat, 9 Jan 2016 10:58:37 +0300 (MSK) (envelope-from dchagin) Date: Sat, 9 Jan 2016 10:58:37 +0300 From: Chagin Dmitry To: Gleb Smirnoff Cc: Adrian Chadd , FreeBSD Net Subject: Re: long network segment call stack can fail Message-ID: <20160109075837.GA4110@chd.heemeyer.club> References: <20160106180008.GA1363@chd.heemeyer.club> <20160109033737.GN1906@FreeBSD.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160109033737.GN1906@FreeBSD.org> User-Agent: Mutt/1.5.24 (2015-08-30) 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: Sat, 09 Jan 2016 07:58:49 -0000 On Fri, Jan 08, 2016 at 07:37:37PM -0800, Gleb Smirnoff wrote: > On Wed, Jan 06, 2016 at 12:50:52PM -0800, Adrian Chadd wrote: > A> hah, that's very pretty. The downside of a completely direct-dispatch > A> network stack. :) > > The stack is big, but shouldn't eat 4 pages anyway. Back in the netgraph yeha, exctly > hacking times, we used to have stack exhaustion with much longer backtraces. > > I expect that somewhere on the list there something huge on stack. > > I assume Dmitry runs with -O0, this is compile that exposes stack > exhaustion first. Did I guess it right, Dmitry? > no, -O2 here -- Have fun! chd