Messages in this thread | | | Subject | Re: Hang on 8-way with 2.6.23-rc2-rt2 | From | Gregory Haskins <> | Date | Tue, 07 Aug 2007 13:27:57 -0400 |
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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 > # > CONFIG_TICK_ONESHOT=y > CONFIG_NO_HZ=y > CONFIG_HIGH_RES_TIMERS=y >
Will do.
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.
Regards, -Greg
(*) There are still issues on the 8-way once we get passed this scheduler problem, however.
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