From owner-freebsd-smp Tue Jul 6 9: 5:20 1999 Delivered-To: freebsd-smp@freebsd.org Received: from par28.ma.ikos.com (par28.ma.ikos.com [137.103.105.228]) by hub.freebsd.org (Postfix) with ESMTP id 0611F1545C for ; Tue, 6 Jul 1999 09:05:16 -0700 (PDT) (envelope-from tich@par28.ma.ikos.com) Received: from [[UNIX: localhost]] ([[UNIX: localhost]]) by par28.ma.ikos.com (8.8.7/8.8.7) id MAA30453; Tue, 6 Jul 1999 12:03:21 -0400 From: Richard Cownie To: Andrew MacIntyre , Dmitry Flitmann Subject: Re: Intel SC450NX hangs under high disk/memory load (2) Date: Tue, 6 Jul 1999 11:49:18 -0400 X-Mailer: KMail [version 1.1.0] Content-Type: text/plain Cc: freebsd-smp@FreeBSD.ORG References: MIME-Version: 1.0 Message-Id: <99070612032100.30449@par28.ma.ikos.com> Content-Transfer-Encoding: 8bit X-KMail-Mark: Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Mon, 05 Jul 1999, Andrew MacIntyre wrote: > On Mon, 5 Jul 1999, Dmitry Flitmann wrote: > > > Any ideas - are there any problems with memory over 512M - > > either kernel, or maybe some drivers/controllers? > > {...} > > > >MAXUSERS is 512 (or 256) > > I haven't seen any responses to your query via the list, so... > > Given that I remember your described usage patterns, I seem to recall > seeing recommendations to use a smaller MAXUSERS value (say 128) and > directly modify the specific values which may need to be increased, such > as NMBCLUSTERS (hope I got that right...). I think it had to do with the > MAXUSERS calculation causing kernel memory usage to expand too much. I'm running 4.0-CURRENT from about 6 June on an SC450NX with 4 x Xeon-500 and 4GB DRAM. The kernel is built with these sizing options: maxusers 256 options VM_KMEM_SIZE_MAX=0x20000000UL options NMBCLUSTERS=8192 If you don't set VM_KMEM_SIZE_MAX, I believe the default is 80MB, which is not much for a machine with >1GB of DRAM. However, this would probably cause a panic rather than the behaviour you're seeing. I believe Linux is good for approx 1GB of DRAM, and latest kernels can be tuned to support 2GB DRAM. As far as I know FreeBSD 3.x supports 2GB DRAM (not sure about 3GB ?) - you need a recent 4.0-CURRENT to support the full 4GB. It turns out to be 4GB - 97MB, because the SC450NX chipset/bios put some of the DRAM above the 4GB address boundary. Richard Cownie (tich@ma.ikos.com) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message