Non-responsive 8.0-RC1

[Peter Jeremy]

On 2009-Nov-29 08:22:26 +1100, Peter Jeremy <peter at server.vk2pj.dyndns.org> wrote:
>My main server is running 8.0/amd64 from between RC1 and RC2 and I've
>recently had a couple of long-duration hangs on it during which time
>processes doing I/O will stop responding.
>
>The first time, it stopped responding for about 25 minutes and then
>spontaneously corrected itself.  I was logged in remotely the whole
>time and Ctrl-T was responding throughout (claiming the process was
>'runnable').  I tried starteding a second session - which got as far
>as reporting the SSH banner I have configured and then did nothing.
>The second time lasted about 5 minutes.

It occurred again this morning on an 8-STABLE from late January after
21 days of uptime.  On a whim, I tried
  perl -e '$a = "x" x 1000000;'
and it immediately recovered - so this is just an extreme version of
the ZFS slowdown that others have reported.

-- 
Peter Jeremy
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