ZFS on AMD64 - any recent crashes?

Morten Strårup morten at lightworkings.dk
Sun Jan 6 13:33:18 PST 2008

Ivan Voras wrote:
> Hi,
> In light of the recent discussion about ZFS stability, does anyone 
> still have kmem_map_too_small panics on AMD64 after tuning it (as 
> presented in http://wiki.freebsd.org/ZFSTuningGuide)?
> I'm interested in reports like this: 
> http://kerneltrap.org/mailarchive/freebsd-current/2007/9/21/271557 
> (note that this report is for an untuned system).
Yes, I've had one such crash.

The machine has 4GB of RAM and initially I set it up with vm.kmem_size 
and vm.kmem_size_max set to 1024M. It's my home fileserver and I'm the 
only regular user. After booting the box I had tested the transfer speed 
back and forth over the net and after that not really used it any more 
that day. The next day I discovered that it had crashed sometime during 
the night. I've since changed the two tuneables above to 1536M and I've 
not had any crashes since. I also tried with 2048M but that only 
resulted in a crash upon boot.

Kind regards

Morten Strårup

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