On Thu, Sep 25, 2008 at 12:26:58PM +0200, Bartosz Stec wrote: > > > Today I've experienced zfs-related kernel panic. Log says: > > savecore: reboot after panic: kmem_malloc(131072): kmem_map too > small: 327684096 total allocated > > Reported amount of memory (327684096) is wrong, because i made suggested > tuning in my loader.conf: > > vm.kmem_size="512M" > vm.kmem_size_max="512M" > > Just to be sure: > > # sysctl vm | grep kmem > vm.kmem_size: 536870912 > vm.kmem_size_min: 0 > vm.kmem_size_max: 536870912 > vm.kmem_size_scale: 3 > > Am I missing something?
I believe this is normal. The amount shown in "total allocated" will not match what you have vm.kmem_size or vm.kmem_size_max set to. Someone more familiar with the VM can explain why this is, but as I understand it, it's 100% normal. Your options are: 1) Consider increasing it from 512M to something like 1.5GB; do not increase it past that on RELENG_7, as there isn't support for more than 2GB total. For example, on a 1GB memory machine, I often recommend 768M. On 2GB machines, 1536M. You will need to run -CURRENT if you want more. 2) Tune ZFS aggressively. Start by setting vfs.zfs.arc_min="16M" and vfs.zfs.arc_max="64M". If your machine has some small amount of memory (768MB, 1GB, etc.), then you probably shouldn't be using ZFS. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
