kmem_size / arc_max ratio
Dan Nelson
dnelson at allantgroup.com
Wed Feb 3 18:55:01 UTC 2010
In the last episode (Feb 03), Rolf Nielsen said:
> I recently installed more RAM in my computer; increased it from 4GB to
> 8GB. Mainly to be able to use a larger arc for zfs. Now my question is,
> how much memory does the kernel need apart from the arc? I currently have
> kmem_size_max 512MB bigger than arc_max. I haven't run into any problems
> so far. I use my computer as desktop only, running WindowMaker and
> normally having xconsole, emiclock, firefox with 5+ tabs, thunderbird,
> amsn, sunbird, thunar, ktorrent and upto 5 or 6 xterms.
>
> My loader.conf looks like this:
>
> vfs.root.mountfrom="zfs:sysroot"
> vm.kmem_size_max=5G
> vm.kmem_size=5G
> vfs.zfs.arc_max=4608M
> vm.pmap.pg_ps_enabled=1
> zfs_load="YES"
> nvidia_load="YES"
vm.kmem_size_max should default to something like 300GB now, so you can
remove that line. vm.pmap.pg_ps_enabled defaults to 1 nowadays, too. I
have an 8GB system and use these settings:
vm.kmem_size=6G
vfs.zfs.arc_max=5G
--
Dan Nelson
dnelson at allantgroup.com
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