Date: Thu, 24 Oct 1996 12:52:31 -0500 (EST) From: John Dyson <dyson@dyson.iquest.net> To: bill@twwells.com (T. William Wells) Cc: freebsd-questions@freebsd.org Subject: Re: more about system hangs Message-ID: <199610241752.MAA06244@dyson.iquest.net> In-Reply-To: <m0vGTIL-0001CzC@twwells.com> from "T. William Wells" at Oct 24, 96 01:10:13 pm
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> > (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
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