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Date: Thu, 12 Apr 2012 12:16:31 +0800 From: Alex Shi <alex.shi@...el.com> To: Fengguang Wu <fengguang.wu@...el.com> CC: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Suresh Siddha <suresh.b.siddha@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>, john stultz <johnstul@...ibm.com>, venki@...gle.com, Thomas Gleixner <tglx@...utronix.de> 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@...el.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@...el.com> > Cc: john stultz <johnstul@...ibm.com> > Cc: venki@...gle.com > Link: http://lkml.kernel.org/r/1320452301.15071.16.camel@sbsiddha-desk.sc.intel.com > Signed-off-by: Thomas Gleixner <tglx@...utronix.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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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