Repeatable ZFS "kmem map too small" panic on 8.0-STABLE

Adam McDougall mcdouga9 at egr.msu.edu
Thu Jan 21 19:06:05 UTC 2010


Put this in /boot/loader.conf:
vm.kmem_size="20G"

It is intentionally higher than your amount of ram.


On 01/21/10 13:05, Doug Poland wrote:
> 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.
>
>



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