Gang scheduling implementation in the ULE scheduler
Peter Grehan
grehan at freebsd.org
Wed Jun 10 20:41:02 UTC 2015
Hi Stefan,
> When I start a Virtual Machine, during the guest's boot, IPIs are sent
> and received correctly between CPUs, but after a few seconds I get:
> spin lock 0xffffffff8164c290 (smp rendezvous) held by
> 0xfffff8000296c000 (tid 100009) too long
> panic: spin lock held too long
Is this on a lightly loaded machine ? I've not looked at your diff in
detail but it's possibly a code path where a spinlock wasn't unlocked,
leaving another CPU spinning.
later,
Peter.
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