Messages in this thread | | | Date | Thu, 12 Apr 2012 12:16:31 +0800 | From | Alex Shi <> | Subject | Re: kernel panic on NHM EX machine |
| |
On 04/12/2012 10:46 AM, Fengguang Wu wrote:
> Hi all, > > This commit makes a difference. Found by auto bisection and confirmed > by reverting it on top of v3.4-rc2. Attached is my kconfig. > > commit 77b0d60c5adf39c74039e2142a1d3cd1e4d53799 > Author: Suresh Siddha <suresh.b.siddha@intel.com> > Date: Fri Nov 4 17:18:21 2011 -0700 > > clockevents: Leave the broadcast device in shutdown mode when not needed > > Platforms with Always Running APIC Timer doesn't use the broadcast timer > but the kernel is leaving the broadcast timer (HPET in this case) > in oneshot mode. > > On these platforms, before the switch to oneshot mode, broadcast device is > actually in shutdown mode. Code checks for empty tick_broadcast_mask and > avoids going into the periodic mode. > > During switch to oneshot mode, add the same tick_broadcast_mask checks in the > tick_broadcast_switch_to_oneshot() and avoid the broadcast device going into > the oneshot mode. > > Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> > Cc: john stultz <johnstul@us.ibm.com> > Cc: venki@google.com > Link: http://lkml.kernel.org/r/1320452301.15071.16.camel@sbsiddha-desk.sc.intel.com > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
It made loopback netperf performance regression on NHM-EP, I thought it is due to few local timers missing on EP, but didn't know it is totally out of work on EX.
| |