Heavy I/O blocks FreeBSD box for several seconds

[Andriy Gapon]

on 31/07/2011 22:03 Rick Macklem said the following:
> Ok, so if the scheduler spin lock is being held too long, what could
> cause this, if it isn't a scheduler bug?
> 
> I can't think of how NFS would affect this beyond causing a heavy I/O
> load, but if there is some way it does, I suppose I need to know what
> that is?

I think I've already referred to the thread on stable at .
This is currently being investigated.

P.S.
Just a pure illustration you can grep for thread_lock to see where else outside
schedulers the sched locks are taken.
-- 
Andriy Gapon