Date: Tue, 20 Apr 2004 19:06:46 -0400 From: Sven Willenberger <sven@dmv.com> To: Stefan Bethke <stb@lassitu.de> Cc: freebsd-current@freebsd.org Subject: Re: Tuning KVA_PAGES / kmem? Message-ID: <1082502406.14481.13.camel@lanshark.dmv.com> In-Reply-To: <F2014C7A-92BB-11D8-BB31-000393496BE8@lassitu.de> References: <F2014C7A-92BB-11D8-BB31-000393496BE8@lassitu.de>
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On Tue, 2004-04-20 at 07:14, Stefan Bethke wrote: > Hi, > > I'm struggling a bit with a box I'm setting up right now: 2x Xeon 2.8 > GHz with 6 GB RAM. Main disk is a RAID 5 on 3ware controller. I'm > running -current from around Easter. > > Occasionally, the machine panics with: > panic: kmem_malloc(4096): kmem_map too small: 275251200 total allocated > at line 337 in file /usr/src/sys/vm/vm_kern.c > > I had stability problems when I was using PAE, so I disabled that for > the moment; even when running GENERIC, I get this panic. > > I dug through the archives, and I found some hints that with >>2 GB > RAM, the auto-tuning might produce undesirable results, so I might need > to tune KVA_PAGES to reserve more address space for the kernel, or > fiddle with VM_KMEM_SIZE_MAX, VM_KMEM_SIZE_SCALE, or some vm sysctls. > > Can someone point me in the right direction? > > > Thanks, > Stefan The following link has been posted here on occasion and it serves as a nice reference (IMESHO) to the relations between kva_pages, vm_kmem_size_scale, etc. I found it useful when experiencing similar errors, albeit with less RAM. http://unix.derkeiler.com/Mailing-Lists/FreeBSD/current/2003-06/1599.html Sven
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