On 03.05.2010 13:01, Jeremy Chadwick wrote:
On Mon, May 03, 2010 at 12:41:50PM +0200, Giulio Ferro wrote:
NFS server amd64 Freebsd 8.0 recent (2 days ago)
This server has been running for several months without problems.
Beginning last week, however, I'm experiencing panics (about 1 per day)
with the error in the subject
Current settings:
vm.kmem_size_scale: 3
vm.kmem_size_max: 329853485875
vm.kmem_size_min: 0
vm.kmem_size: 2764046336
...
hw.physmem: 8568225792
hw.usermem: 6117404672
hw.realmem: 9395240960
...
vfs.zfs.l2arc_noprefetch: 0
vfs.zfs.l2arc_feed_secs_shift: 1
vfs.zfs.l2arc_feed_secs: 1
vfs.zfs.l2arc_headroom: 128
vfs.zfs.l2arc_write_boost: 67108864
vfs.zfs.l2arc_write_max: 67108864
vfs.zfs.arc_meta_limit: 431882240
vfs.zfs.arc_meta_used: 431874720
vfs.zfs.arc_min: 215941120
vfs.zfs.arc_max: 1727528960
I've set nothing in either /boot/loader.conf or sysctl.conf
What should I do?
You need to adjust vm.kmem_size to provide more space for the ARC.
Below are ZFS-relevant entries in our /boot/loader.conf on production
RELENG_8 systems with 8GB of RAM. The reason we set kmem_size to half
our physical system memory is because I didn't want to risk other
processes which use a larger maxdsiz/dfldsiz/maxssiz to potentially
exhaust all memory.
# Increase vm.kmem_size to allow for ZFS ARC to utilise more memory.
vm.kmem_size="4096M"
vfs.zfs.arc_max="3584M"
# Disable ZFS prefetching
# http://southbrain.com/south/2008/04/the-nightmare-comes-slowly-zfs.html
# Increases overall speed of ZFS, but when disk flushing/writes occur,
# system is less responsive (due to extreme disk I/O).
# NOTE: 8.0-RC1 disables this by default on systems<= 4GB RAM anyway
# NOTE: System has 8GB of RAM, so prefetch would be enabled by default.
vfs.zfs.prefetch_disable="1"
# Decrease ZFS txg timeout value from 30 (default) to 5 seconds. This
# should increase throughput and decrease the "bursty" stalls that
# happen during immense I/O with ZFS.
# http://lists.freebsd.org/pipermail/freebsd-fs/2009-December/007343.html
# http://lists.freebsd.org/pipermail/freebsd-fs/2009-December/007355.html
vfs.zfs.txg.timeout="5"
Thanks, I'll try these settings.
I'll keep you posted.
_______________________________________________
freebsd-stable@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
