Date: Thu, 21 Jan 2010 12:05:34 -0600 From: Doug Poland <doug@polands.org> To: freebsd-fs@freebsd.org Subject: Repeatable ZFS "kmem map too small" panic on 8.0-STABLE Message-ID: <4B58976E.1020402@polands.org>
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Hello,
I've got an 8.0-STABLE (amd64) box with 4GB RAM. The machine is running
off a 6-disk RAIDZ1 booting from GPT. The box consistently panics on
unixbench's fsdisk program.
I have been gathering some metrics in an attempt to isolate the
parameters that are significant, but I admit I do not really understand
all the relationships. At this point, I have nothing set in
/boot/loader.conf
Here are some of the values I was recording within seconds of the panic:
# dmesg | grep memory
real memory = 4294967296 (4096 MB)
avail memory = 3961372672 (3777 MB)
kstat.zfs.misc.arcstats.size: 308522248
vfs.zfs.arc_max: 829480960
vfs.zfs.arc_meta_limit: 207370240
vfs.zfs.arc_meta_used: 165575944
vfs.zfs.arc_min: 103685120
vm.kmem_size: 1327169536
vm.kmem_size_max: 329853485875
# vmstat -m | egrep 'InUse|solaris'
Type InUse MemUse HighUse
solaris 491349 1316172K -
% zpool status
pool: bethesda
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
bethesda ONLINE 0 0 0
raidz1 ONLINE 0 0 0
gpt/disk0 ONLINE 0 0 0
gpt/disk1 ONLINE 0 0 0
gpt/disk2 ONLINE 0 0 0
gpt/disk3 ONLINE 0 0 0
gpt/disk4 ONLINE 0 0 0
gpt/disk5 ONLINE 0 0 0
errors: No known data errors
My concern is if I can panic the box with a simple file system
benchmark, what will happen when I rysnc files across a 1GB LAN
connection? I am very willing to run any number of tests and tweek ZFS
as necessary. Please advise.
--
Regards,
Doug
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