From owner-freebsd-questions Thu Oct 24 10:52:46 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id KAA09865 for questions-outgoing; Thu, 24 Oct 1996 10:52:46 -0700 (PDT) Received: from dyson.iquest.net ([198.70.144.127]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id KAA09857 for ; Thu, 24 Oct 1996 10:52:39 -0700 (PDT) Received: (from root@localhost) by dyson.iquest.net (8.8.2/8.6.9) id MAA06244; Thu, 24 Oct 1996 12:52:31 -0500 (EST) From: John Dyson Message-Id: <199610241752.MAA06244@dyson.iquest.net> Subject: Re: more about system hangs To: bill@twwells.com (T. William Wells) Date: Thu, 24 Oct 1996 12:52:31 -0500 (EST) Cc: freebsd-questions@freebsd.org In-Reply-To: from "T. William Wells" at Oct 24, 96 01:10:13 pm Reply-To: dyson@freebsd.org X-Mailer: ELM [version 2.4 PL24 ME8] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk > > (It appears that the list is dropping my messages randomly. Here > is a resend.) > > I've been tracing down the hangs and it appears to be within > kmem_alloc, called from pmap_pinit. I don't think I can trace it > down further, as there's no way to stick debugs in this code. > (Debugs that won't bring the system to its knees anyway....) > > What I'm wondering is this: since it's allocating out of > kernel_map is it possible to run out of space there? And doesn't > this code simply wait for memory, rather than panicing? If so, > that would account for my hangs. Is there a way I can check for > this from ddb or by adding debugs? Other suggestions? > Got your message :-). kernel_map cannot easily run out of space, but there is opportunity for problems if the system cannot allocate map entries or page-table pages. You have narrowed the problem down ALOT... Will study the problem further, but if you get any more info -- let me/us know!!! John