ZFS on RPi (was: zfs on BeagleBone)

[Peter Jeremy]

On 2015-Mar-11 13:09:32 -0400, Brett Wynkoop <freebsd-arm at wynn.com> wrote:
>Since someone suggested as part of my testing the USB Flash Disk
>crashes on my BeagleBone that I try ZFS I have.  At the moment I am
>running the same copy operation that caused it to crash on UFS.

Prompted by this, I tried ZFS on my RPi (running head r279807), with
less success.  When I issue a "zpool create", I get a panic after ~5s
- long enough for "systat -v" to claim 4096 KB/t, 325 tps, 1301 MB/s
for mmcsd.

Unfortunately, despite "options KDB_TRACE;options STACK" it generates an
empty stack backtrace.  The dump also fails :-(

panic: vm_fault: fault on nofault entry, addr: dd2f1000
KDB: stack backtrace:
Uptime: 11m46s
Physical memory: 473 MB
Dumping 36 MB:sdhci_bcm0: DMA in use

The tuning I did was:
vfs.zfs.arc_max="24M"
vfs.zfs.vdev.cache.size="5M"

-- 
Peter Jeremy
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