On Tue, 2007-08-07 at 10:03 -0700, Daniel Walker wrote:
> Could you drop the following config options and test again?
> # Processor type and features
I have a patch which works around the issue too, which I will forward
momentarily. It appears as though there is a deadlock either between
two task_rq_locks, or between a task_rq_lock and something else. The
patch I wrote changes the "double_lock_balance()" function to a full DP
algorithm under contention. Technically I think the original
implementation was correct which is why my patch is really a workaround:
I think its just plastering over the real issue. But in any case, the
8-way system is no longer slow and no longer nmi_watchdog/softlockups on
me(*). Perhaps it will at least help in finding the root cause.
(*) There are still issues on the 8-way once we get passed this
scheduler problem, however.
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