From owner-freebsd-current@FreeBSD.ORG Tue Feb 22 04:02:55 2005 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9AFEC16A4CE for ; Tue, 22 Feb 2005 04:02:55 +0000 (GMT) Received: from tinker.exit.com (tinker.exit.com [206.223.0.1]) by mx1.FreeBSD.org (Postfix) with ESMTP id 44A6B43D1D for ; Tue, 22 Feb 2005 04:02:55 +0000 (GMT) (envelope-from frank@exit.com) Received: from realtime.exit.com (realtime [206.223.0.5]) by tinker.exit.com (8.13.1/8.13.1) with ESMTP id j1M42qRX098033; Mon, 21 Feb 2005 20:02:52 -0800 (PST) (envelope-from frank@exit.com) Received: from realtime.exit.com (localhost [127.0.0.1]) by realtime.exit.com (8.13.1/8.12.9) with ESMTP id j1M42pnQ060292; Mon, 21 Feb 2005 20:02:51 -0800 (PST) (envelope-from frank@realtime.exit.com) Received: (from frank@localhost) by realtime.exit.com (8.13.1/8.13.1/Submit) id j1M42pt9060271; Mon, 21 Feb 2005 20:02:51 -0800 (PST) (envelope-from frank) From: Frank Mayhar Message-Id: <200502220402.j1M42pt9060271@realtime.exit.com> In-Reply-To: <20050221191909.B89025@carver.gumbysoft.com> To: Doug White Date: Mon, 21 Feb 2005 20:02:50 -0800 (PST) X-Copyright0: Copyright 2005 Frank Mayhar. All Rights Reserved. X-Copyright1: Permission granted for electronic reproduction as Usenet News or email only. X-Mailer: ELM [version 2.4ME+ PL119 (25)] MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII cc: current@freebsd.org Subject: Re: Hard hangs running 6-current. X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: frank@exit.com List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Feb 2005 04:02:55 -0000 Doug White wrote: > Try one of these loader tunables: > 1. Disabling SMP (kern.smp.disabled=1) > 2. Disabling mpsafenet (debug.mpsafenet=0) I run with debug.mpsafenet=0 (due to a bug I ran into some time ago which I haven't looked at recently). The current kernel is running with HTT turned off and no SMP builtin. So kern.smp.disabled=1 is kind of redundant. So no dice on either one of these. > This may be a symptom of a deadlock we're observing on > sparc64 in the network stack. Either one of these should stop the > problem, if its the issue we were seeing earlier today. Doesn't look like it, I'm afraid. > If you especially adventurous, try setting net.inet.tcp.do_tcpdrain=0 > instead of the options above. This might cause mbuf exhaustion but is > implicated in the deadlock. > > This is a total hunch and I may be influenced by the time put in on this > issue today :) If you're interested, you might take a look at http://www.freebsd.org/cgi/query-pr.cgi?pr=77751 It has my results for the day. Warning: Lots of ath debug output. I'm pretty sure it's the ath driver that's the problem, particularly in light of my most recent results. Thanks for the ideas, though. -- Frank Mayhar frank@exit.com http://www.exit.com/ Exit Consulting http://www.gpsclock.com/ http://www.exit.com/blog/frank/