lkml.org 
[lkml]   [2007]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Hang on 8-way with 2.6.23-rc2-rt2
From
Date
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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-08-07 19:33    [W:0.113 / U:0.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site