Date: Wed, 18 Jun 2003 01:34:01 -0700 From: David Schultz <das@FreeBSD.ORG> To: Peter Losher <Peter_Losher@isc.org> Cc: current@FreeBSD.ORG Subject: Re: Problems tuning kmem_map on 5.1-REL box. Message-ID: <20030618083401.GA74409@HAL9000.homeunix.com> In-Reply-To: <20030617080628.H1802@farside.isc.org> References: <20030617080628.H1802@farside.isc.org>
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On Tue, Jun 17, 2003, Peter Losher wrote: > Hi - > > If this sort of question is better asked on a more specialized list > @freebsd.org, please let me know. (Since 5.1 is still considered a > developmental release, one doesn't know if either -current or -stable > would be more appropriate. So I am sending it to -current. > > So, I recently put a Quad-Xeon server (w/ 4GB of RAM) into production as > primarily as a master FTP server for ISC as well as for FreeBSD (US/IPv6 > side of ftp.freebsd.org). All has been going well for the past couple of > weeks until 5.1 was released. Traffic spiked, and the server started > panicking every 12 hours: > > > panic: kmem_malloc(4096): kmem_map too small: 377487360 total allocated > > So after looking at the archives, I read that FreeBSD had issues with > installed memory above 2GB, so I set the sysctl kern.maxvnodes=130000, but > to no effect: > > > panic: kmem_malloc(16384): kmem_map too small: 293519360 total allocated > > I have since removed my NMBCLUSTER setting in the kernel, so it would be > set automatically, I have even set VM_KMEM_SIZE_SCALE="2" (I haven't messed > with the other KMEM kernel options, as I was hoping to avoid it) And a > couple of hours ago I updated the kernel with the latest kern_malloc.c file > in the RELENG_5_1 branch. To allow the kmem_map to exceed 200 MB, you'll also need to tweak VM_KMEM_SIZE_MAX to (for example) '(1024 * 1024 * 1024)'. BTW, the formula, which I stole from vmparam.h, is: min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
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