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Date: Wed, 13 Aug 2008 12:58:45 +0200
From: Milan Plzik <milan.plzik@...il.com>
To: linux-kernel@...r.kernel.org
Subject: Re: Timer unstability on when using C2 and deeper sleep states
(Dell Latitude XT)
I apologize for replying on my own mail (and also for top-posting, but
this information is global update, not exactly fitting any of topics
mentioned below).
After playing for a longer while I found out that the system ends
sometimes in state where, in order to do anything useful, I need to
press keys on keyboard. Otherwise, the system just stalls and does
nothing. I have no idea why does this happen (especially when I know
that OHCI or wireless network adapter produce fair amount of
interrupts). My /proc/interrupts is below. Just for the record, chipset
on board is ATI RS600 with (apparently from lspci) ATI SB600
southbridge.
# cat /proc/interrupts
CPU0 CPU1
0: 94 0 IO-APIC-edge timer
1: 3034 0 IO-APIC-edge i8042
8: 1 0 IO-APIC-edge rtc0
9: 1 0 IO-APIC-fasteoi acpi
12: 13677 0 IO-APIC-edge i8042
14: 13679 0 IO-APIC-fasteoi pata_atiixp
15: 0 0 IO-APIC-edge pata_atiixp
16: 0 0 IO-APIC-fasteoi ohci_hcd:usb2
17: 238527 0 IO-APIC-fasteoi ohci_hcd:usb3, ohci_hcd:usb5, HDA Intel
18: 26960 0 IO-APIC-fasteoi ndiswrapper, fglrx[0]@PCI:1:5:0
19: 475 0 IO-APIC-fasteoi ehci_hcd:usb1
20: 20 0 IO-APIC-fasteoi ohci_hcd:usb4, ohci_hcd:usb6
22: 0 0 IO-APIC-fasteoi mmc0
23: 3 0 IO-APIC-fasteoi ohci1394
316: 2 0 PCI-MSI-edge eth0
NMI: 0 0 Non-maskable interrupts
LOC: 629038 206882 Local timer interrupts
RES: 15738 15713 Rescheduling interrupts
CAL: 24 72 function call interrupts
TLB: 968 2244 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
SPU: 0 0 Spurious interrupts
ERR: 0
On Ut, 2008-08-12 at 20:33 +0200, Milan Plzik wrote:
> Good day,
>
> This e-mail will be a bit longer, as I will describe everything I was
> able to find out about $subj. I'm not 100% sure that the issue is what
> it seems to be (not even sure I'm posting to correct mailing list), so
> if you see I did something wrong, please tell me. Also please, Cc: me,
> as I'm not (yet, I was not able to find out how) subscribed to this
> mailing list.
>
> I started to experiment with Linux on Dell Latitude XT, actually with
> 2.6.26 (for more info see [1]). The system seems to be more or less
> operational, when booting without any special arguments, but sometimes
> it hangs for few seconds with no reason. This becomes more apparent when
> e.g. playing movie (player sometimes stops for really long while), and
> is also apparent when using powertop, which tells me I had 20000
> wakeups/s (yes, twenty thousand) per second, although sum of wakeups
> from the topmost wakeup causes does not reach 2000. Sometimes, however,
> this number goes down to reasonable values, but only for a while.
>
> I spent some time experimenting with linux kernel parameters; first
> with clocksource, where with all possible sources (but jiffies, which
> seemed to work) were having the same problem. With nohz=off parameter
> the computer was stable (but it did not enter power saving states), and
> after trying processor.max_cstate=1, computer was stable as well (any
> higher state causes instability) and powertop was returning meaningful
> values.
>
> Any attempts I made failed, so I'll welcome any suggestion, I have
> never seen something like this before.
>
> Best regards,
> Milan Plzik
>
>
> [1] My configuration follows:
>
> # uname -a
> Linux tiny 2.6.26-gentoo #18 SMP Tue Aug 12 12:40:57 CEST 2008 x86_64 Intel(R) Core(TM)2 CPU U7600 @ 1.20GHz GenuineIntel GNU/Linux
>
> # grep -e HZ -e HPET -e RTC -e IDLE -e CPUFREQ /usr/src/linux/.config |grep -v "not set"
> CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
> CONFIG_NO_HZ=y
> CONFIG_HPET_TIMER=y
> CONFIG_HPET_EMULATE_RTC=y
> CONFIG_HZ_1000=y
> CONFIG_HZ=1000
> CONFIG_X86_ACPI_CPUFREQ=y
> CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y
> CONFIG_CPU_IDLE=y
> CONFIG_CPU_IDLE_GOV_LADDER=y
> CONFIG_CPU_IDLE_GOV_MENU=y
> CONFIG_HPET=y
> CONFIG_HPET_MMAP=y
> CONFIG_RTC_LIB=y
> CONFIG_RTC_CLASS=y
> CONFIG_RTC_HCTOSYS=y
> CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
> # RTC interfaces
> CONFIG_RTC_INTF_SYSFS=y
> CONFIG_RTC_INTF_PROC=y
> CONFIG_RTC_INTF_DEV=y
> CONFIG_RTC_INTF_DEV_UIE_EMUL=y
> # I2C RTC drivers
> # SPI RTC drivers
> # Platform RTC drivers
> CONFIG_RTC_DRV_CMOS=y
> # on-CPU RTC drivers
>
> # cat /proc/cpuinfo
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 15
> model name : Intel(R) Core(TM)2 CPU U7600 @ 1.20GHz
> stepping : 2
> cpu MHz : 800.000
> cache size : 2048 KB
> physical id : 0
> siblings : 2
> core id : 0
> cpu cores : 2
> apicid : 0
> initial apicid : 0
> fpu : yes
> fpu_exception : yes
> cpuid level : 10
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
> constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est
> tm2 ssse3 cx16 xtpr lahf_lm
> bogomips : 2402.19
> clflush size : 64
> cache_alignment : 64
> address sizes : 36 bits physical, 48 bits virtual
> power management:
>
> processor : 1
> vendor_id : GenuineIntel
> cpu family : 6
> model : 15
> model name : Intel(R) Core(TM)2 CPU U7600 @ 1.20GHz
> stepping : 2
> cpu MHz : 800.000
> cache size : 2048 KB
> physical id : 0
> siblings : 2
> core id : 1
> cpu cores : 2
> apicid : 1
> initial apicid : 1
> fpu : yes
> fpu_exception : yes
> cpuid level : 10
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
> pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
> constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est
> tm2 ssse3 cx16 xtpr lahf_lm
> bogomips : 2400.00
> clflush size : 64
> cache_alignment : 64
> address sizes : 36 bits physical, 48 bits virtual
> power management:
>
> # lspci
> 00:00.0 Host bridge: ATI Technologies Inc Device 7930
> 00:01.0 PCI bridge: ATI Technologies Inc Device 7932
> 00:04.0 PCI bridge: ATI Technologies Inc Device 7934
> 00:06.0 PCI bridge: ATI Technologies Inc Device 7936
> 00:07.0 PCI bridge: ATI Technologies Inc Device 7937
> 00:13.0 USB Controller: ATI Technologies Inc SB600 USB (OHCI0)
> 00:13.1 USB Controller: ATI Technologies Inc SB600 USB (OHCI1)
> 00:13.2 USB Controller: ATI Technologies Inc SB600 USB (OHCI2)
> 00:13.3 USB Controller: ATI Technologies Inc SB600 USB (OHCI3)
> 00:13.4 USB Controller: ATI Technologies Inc SB600 USB (OHCI4)
> 00:13.5 USB Controller: ATI Technologies Inc SB600 USB Controller (EHCI)
> 00:14.0 SMBus: ATI Technologies Inc SB600 SMBus (rev 14)
> 00:14.1 IDE interface: ATI Technologies Inc SB600 IDE
> 00:14.2 Audio device: ATI Technologies Inc SB600 Azalia
> 00:14.3 ISA bridge: ATI Technologies Inc SB600 PCI to LPC Bridge
> 00:14.4 PCI bridge: ATI Technologies Inc SB600 PCI to PCI Bridge
> 01:05.0 VGA compatible controller: ATI Technologies Inc Device 7942
> 03:01.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
> 03:01.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant
> IEEE 1394 Host Controller
> 03:01.3 SD Host controller: Texas Instruments PCIxx12 SDA Standard
> Compliant SD Host Controller
> 09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5756ME
> Gigabit Ethernet PCI Express
> 0b:00.0 Network controller: Broadcom Corporation BCM4310 USB Controller
> (rev 01)
>
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