Watchdog timeouts on isp(4)

[Peter Jeremy]

On 2011-Oct-28 09:26:03 +1100, Peter Jeremy <peter at server.vk2pj.dyndns.org> wrote:
>I have a 16-CPU SunFire V890 running FreeBSD-current/sparc64 r226167.
>Whilst doing some stress testing (6 parallel -j16 buildworlds with
>regular "sysctl vm.vmtotal"), I have started seeing isp watchdog
>timeouts.  I didn't see this with similar testing on about r223035.

Having done some more careful checks, I did find a couple of timeouts
with an older kernel but it was quite rare whereas it's now fairly
easy for me to trigger.

>The messages look like:
>
>(da4:isp0:0:4:0): first watchdog (handle 0xb4d820d9) timed out- deferring for grace period
>(da4:isp0:0:4:0): first watchdog (handle 0xb4d920ba) timed out- deferring for grace period
>(da11:isp1:0:5:0): first watchdog (handle 0x5f0620c9) timed out- deferring for grace period
>(da11:isp1:0:5:0): first watchdog (handle 0x5f07203a) timed out- deferring for grace period
>(da11:isp1:0:5:0): first watchdog (handle 0x5f08208c) timed out- deferring for grace period
>...

marius@, mjacob@ and I are investigating this off-list.  If anyone else
is seeing something similar, I'd appreciate them contacting me.

-- 
Peter Jeremy
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