Messages in this thread | | | Subject | RE: 2.6.23.8, ondemand scaling governor: "BUG: soft lockup detected on CPU#0!" | Date | Mon, 19 Nov 2007 17:01:11 -0800 | From | "Pallipadi, Venkatesh" <> |
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>-----Original Message----- >From: linux-kernel-owner@vger.kernel.org >[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Harald Dunkel >Sent: Monday, November 19, 2007 4:19 PM >To: Linux Kernel list >Subject: 2.6.23.8, ondemand scaling governor: "BUG: soft >lockup detected on CPU#0!" > >Hi folks, > >using the ondemand scaling governour I see some error messages >in kern.log, e.g.: > >Nov 20 01:00:46 bugs kernel: BUG: soft lockup detected on CPU#0! >Nov 20 01:00:46 bugs kernel: [<c013cf8d>] softlockup_tick+0x91/0xa6 >Nov 20 01:00:46 bugs kernel: [<c012269c>] >update_process_times+0x3a/0x5d >Nov 20 01:00:46 bugs kernel: [<c0131219>] tick_sched_timer+0x115/0x164 >Nov 20 01:00:46 bugs kernel: [<c012d311>] >hrtimer_interrupt+0x102/0x191 >Nov 20 01:00:46 bugs kernel: [<c0106cd6>] timer_interrupt+0x2e/0x34 >Nov 20 01:00:46 bugs kernel: [<c013d1f6>] handle_IRQ_event+0x1a/0x3f >Nov 20 01:00:46 bugs kernel: [<c013e4e1>] handle_level_irq+0xa8/0xb7 >Nov 20 01:00:46 bugs kernel: [<c0106367>] do_IRQ+0x53/0x6c >Nov 20 01:00:46 bugs kernel: [<c0104853>] common_interrupt+0x23/0x28 >Nov 20 01:00:46 bugs kernel: [<c011007b>] >smp_apic_timer_interrupt+0x1a/0x70 >Nov 20 01:00:46 bugs kernel: [<c0102a36>] default_idle+0x27/0x39 >Nov 20 01:00:46 bugs kernel: [<c010234c>] cpu_idle+0x46/0x68 >Nov 20 01:00:46 bugs kernel: [<c032e9e8>] start_kernel+0x24d/0x252 >Nov 20 01:00:46 bugs kernel: [<c032e317>] unknown_bootoption+0x0/0x196 >Nov 20 01:00:46 bugs kernel: ======================= > >This seems to happen when the load drops below the threshold and >the ondemand governor changes the CPU from 2GHz to 400MHz. If I use >the "performance" governor instead, then there is no such message. >If I set it back to "ondemand", then the message is printed >immediately. > ># uname -a >Linux bugs 2.6.23.8 #1 PREEMPT Sun Nov 18 09:14:13 CET 2007 >i686 GNU/Linux ># cat /proc/cpuinfo >processor : 0 >vendor_id : GenuineIntel >cpu family : 6 >model : 13 >model name : Intel(R) Pentium(R) M processor 2.00GHz >stepping : 8 >cpu MHz : 400.000 >cache size : 2048 KB >fdiv_bug : no >hlt_bug : no >f00f_bug : no >coma_bug : no >fpu : yes >fpu_exception : yes >cpuid level : 2 >wp : yes >flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr >pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe >nx bts est tm2 >bogomips : 798.34 >clflush size : 64 > > >Please mail if I can help to track this down. > >
Can you try switching to powersave governor (which should always run CPU at 400MHz) and see whether you see similar error?
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