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Date:      Fri, 6 Dec 2002 03:29:42 -0800
From:      David Schultz <dschultz@uclink.Berkeley.EDU>
To:        Varshavchick Alexander <alex@metrocom.ru>
Cc:        Terry Lambert <tlambert2@mindspring.com>, freebsd-questions@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG
Subject:   Re: maxusers and random system freezes
Message-ID:  <20021206112942.GA16222@HAL9000.homeunix.com>
In-Reply-To: <Pine.GSO.4.33.0212051658380.7912-100000@apache.metrocom.ru>
References:  <20021205135319.GA12456@HAL9000.homeunix.com> <Pine.GSO.4.33.0212051658380.7912-100000@apache.metrocom.ru>

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Thus spake Varshavchick Alexander <alex@metrocom.ru>:
> Thank you David for such an excellent explanation. So if sysctl reports
> 
> vm.zone_kmem_pages: 5413
> vm.zone_kmem_kvaspace: 218808320
> vm.kvm_size: 1065353216
> vm.kvm_free: 58720256
> 
> does it mean that total KVA reservation is 1065353216 bytes (1G) and
> almost all of it is really mapped to physical memory because only 58720256
> (56M) is free, and the server is balancing on the edge of crashing with
> KVA going out?

Yes, 56 MB of unreserved kernel virtual memory (modulo
fragmentation) is probably pushing it for a busy server.
Try bumping KVA_PAGES.

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