Jeremy Chadwick wrote: > The tuning variables I advocate for a system with 2GB of RAM or more, > on RELENG_7, are: > vm.kmem_size="1536M" > vm.kmem_size_max="1536M"
There is no point in setting vm.kmem_size_max. Setting vm.kmem_size is enough. vm.kmem_size_max is used for auto-tuning of kmem size which is in this case actually overriden by manually setting vm.kmem_size. > vfs.zfs.arc_min="16M" > vfs.zfs.arc_max="64M" > vfs.zfs.prefetch_disable="1" > You can gradually increase arc_min and arc_max by ~16MB increments as > you see fit; you should see general performance improvements as they > get larger (more data being kept in the ARC), but don't get too crazy. > I've tuned arc_max up to 128MB before with success, but I don't want > to try anything larger without decreasing kmem_size_*. Can you explain why would you have to decrease kmem_size to use larger ARC? AFAIK it should be contrary to what you are saying: when you use larger kmem_size you can also use larger arc_max. My suggestion if you are using kmem_size of 1536M would be to not tune arc_min and arc_max if your system isn't panicing. If it does you should try decreasing arc_max (from it's default value) until it doesn't. _______________________________________________ freebsd-hardware@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hardware To unsubscribe, send any mail to "[EMAIL PROTECTED]"