absurd I/O perf with ZFS: hangs on zfs->cv)

[Eitan Adler]

Hi all.


Running FreeBSD 9.1-Release, I am seeing some absurd hangs (10 minutes
or more to open a file) with SIGINFO informing me that the process is
stuck on zio->io_cv.

Does anyone have any suggestions for what I want to look at to tune
this?   This is on a newly bought laptop with large amounts of RAM and
almost nothing else running.

Please CC me as I am not subscribed.

-- 
Eitan Adler