8.1-RELEASE ZFS hangs

[Sergey Zaharchenko]

Hello Matthias!

Tue, Sep 07, 2010 at 09:32:04PM +0200 you wrote:

> Did you try 8 stable to see if it makes any difference?

This server is to be going into production soon, so I'm not in the best
position to try things. I've however tried disabling prefetch and ZIL.
This helped ZFS pass bonnie++, but it deadlocked later on a repeated
make -j 4 buildworld. top shows:

CPU:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle
Mem: 194M Active, 32M Inact, 1844M Wired, 48M Cache, 523M Buf, 5799M Free

19285 root             1  76    0 13060K  8876K zfs     2   0:00  0.00% cc1
19141 root             1  76    0 13060K  8876K tx->tx  1   0:00  0.00% cc1
19745 root             1  76    0 13052K  9116K tx->tx  1   0:00  0.00% cc1
 1154 root             1  44    0  6896K   980K tx->tx  0   0:00  0.00% syslogd
 2136 root             1  44    0  5808K   812K zio->i  2   0:00  0.00% newsyslog

etc.

This, apart from anything else, may indicate that disabling the features
only masks the problems with ZFS, but doesn't eliminate them completely.

Thanks for your input,

--
Sergey Zaharchenko
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