Messages in this thread | | | Date | Fri, 17 Jun 2005 13:08:51 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 |
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* K.R. Foley <kr@cybsft.com> wrote:
> Just had an opportunity to check this. Everything does indeed seem to > be working OK with this disabled. No lock up messages, no perceived > problems.
btw., you have this enabled in your config:
CONFIG_DEBUG_RT_LOCKING_MODE=y
this causes old-style spinlocking to be activated by default. I.e. you dont get most of the benefits of PREEMPT_RT. You can reactivate it via:
echo 1 > /proc/sys/kernel/preempt_locks
but obviously this runtime flag involves some runtime overhead in the locking code. This .config option is mainly meant to enable the measurement of the locking overhead of PREEMPT_RT, and to debug boot problems that might be related to PREEMPT_RT locking. So you'd almost always want to run with DEBUG_RT_LOCKING_MODE turned off.
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