It didn't.
Changing to 2.6.13.4-bs5 solved the problem though. I haven't tested a lot
yet, but so far I haven't seen any soft lockups.
// Joel
On Thu, 24 Nov 2005, Joel Palmius wrote:
So what do I do? Might enabling pre-emption help?
// Joel
On Thu, 24 Nov 2005, Jeff Dike wrote:
On Wed, Nov 23, 2005 at 07:53:23PM +0100, Joel Palmius wrote:
> The below happens more often than not (but not always). The host is
> athlon64 running in 32-bit mode. Host kernel is 2.6.14-skas3-v9-pre7.
> Guest kernel is 2.6.14-bs1. Same thing happens in skas0 and skas3.
>
> When the machine boots correctly it seems stable though.
It's not really a problem in the sense that it's a crash. It's more
of a latenciy issue. UML isn't getting a timer interrupt in 10 sec
(!), which is 1000 times longer than it should.
The cases I've seen are when the host is doing heavy I/O or UML is
going in and out of the kernel very frequently. The UML timer is
based on SIGVALRM, which fires based on userspace time.
Blaisorblade made a suggestion a while back to use SIGPROF instead,
which fires based on when the process is in the kernel, as well. This
would likely at least alleviate the problem, but I'm suspicious that
it would be covering up the real underlying problem. I don't think
that UML spending time in the kernel should cause a 1000-fold decrease
in VTALRM delivery frequency.
Jeff
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