Ben Kelly wrote:
On Sep 26, 2008, at 4:43 AM, Bartosz Stec wrote:
Jeremy Chadwick wrote:
These are the tuning settings I use:
vm.kmem_size="1536M"
vm.kmem_size_max="1536M"
vfs.zfs.arc_min="16M"
vfs.zfs.arc_max="64M"
Yesterday I've added 512 MB memory to box (sum 1,5GB), and set
vm.kmem_size and vm.kmem_size to "1024M". With pieces of 1024MB,
512MB, 256MB, 256MB available and 3 memory slots it is hard to have
2GB RAM ;)
Until now it survived world cleaning/building/installing/bonnie++
benchmarkink/fs scrubing and general usage. Memory usage seems
stable. If unfortunately kmem exhaustion will happen again I will
experiment with ARC settings.
IMHO you've explained gently a lot of zfs tuning concerns in this
thread and they should be added to tuning guide - espacially
explanation of ARC and prefetch settings. Thanks again!
Did you increase KVA_PAGES in your kernel config as well?
The default of 256 only allows 1GB of kernel memory total. Setting
KVA_PAGES to 384 would probably be good for a kmem_size of 1GB. This
would give leave you with 512MB of space for other things in the
kernel. In your kernel config:
options KVA_PAGES=384
Sorry if you already knew this. I know its in the zfs tuning guide.
I just hadn't seen it mentioned in the thread yet and wanted to make
sure it wasn't missed.
Hope that helps.
- Ben
Indeed I know that.
options KVA_PAGES=512
is included in my kernel config.
Until now:
# uptime
10:12 up 3 days, 10:32, 1 user, load averages: 0,00 0,03 0,00
Thanks :)
--
Bartosz Stec
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