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    SubjectRe: What's the right value for idle= (was: Re: [linux-pm] regression on P-II SMP)
    On Sun, 21 Feb 2010, Arjan van de Ven wrote:

    > can you get us /proc/cpuinfo ?
    > (only one of the cpus, the other ones are just duplicates)

    They are a bit different (different stepping):

    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 5
    model name : Pentium II (Deschutes)
    stepping : 2
    cpu MHz : 399.077
    cache size : 512 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 apic sep mtrr pge mca cmov pat pse36 mmx fxsr
    bogomips : 799.35
    clflush size : 32

    processor : 1
    vendor_id : GenuineIntel
    cpu family : 6
    model : 5
    model name : Pentium II (Deschutes)
    stepping : 1
    cpu MHz : 399.077
    cache size : 512 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 apic sep mtrr pge mca cmov pat pse36 mmx fxsr
    bogomips : 798.19
    clflush size : 32

    > if the CPU advertizes mwait, we normally ought to use it,
    > but there's some exceptions to that due to buggy-as-**** bioses.
    >
    > can you also run powertop -d and get that output ?
    > (preferably on a fully known working kernel)

    on 2.6.25 with "root=/dev/sdb1 acpi=noirq scsi_mod.scan=sync netconsole=..."
    kernel command line (dmesg follows in a reply to another mail)

    # powertop -d
    PowerTOP 1.10 (C) 2007, 2008 Intel Corporation

    Collecting data for 15 seconds


    < Detailed C-state information is not available.>
    P-states (frequencies)
    Wakeups-from-idle per second : 40.3 interval: 15.0s
    no ACPI power usage estimate available
    Top causes for wakeups:
    41.2% ( 26.1) <interrupt> : ohci_hcd:usb3, tmscsim
    40.2% ( 25.5) <interrupt> : ohci_hcd:usb1, bttv0
    6.3% ( 4.0) <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)
    3.2% ( 2.0) <kernel core> : clocksource_register (clocksource_watchdog)
    3.2% ( 2.0) <kernel core> : sym_timer (sym53c8xx_timer)
    0.9% ( 0.6) <interrupt> : eth0
    0.8% ( 0.5) hald-addon-stor : schedule_timeout (process_timeout)
    0.8% ( 0.5) <kernel core> : __netdev_watchdog_up (dev_watchdog)
    0.8% ( 0.5) <kernel core> : e100_up (e100_watchdog)
    0.7% ( 0.5) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer)
    0.3% ( 0.2) <interrupt> : sym53c8xx
    0.3% ( 0.2) init : schedule_timeout (process_timeout)
    0.3% ( 0.2) <kernel core> : page_writeback_init (wb_timer_fn)
    0.3% ( 0.2) hald-addon-acpi : do_nanosleep (hrtimer_wakeup)
    0.1% ( 0.1) sshd : sk_reset_timer (tcp_write_timer)
    0.1% ( 0.1) <kernel core> : neigh_add_timer (neigh_timer_handler)
    0.1% ( 0.1) sh : start_this_handle (commit_timeout)
    0.1% ( 0.1) cron : do_nanosleep (hrtimer_wakeup)
    0.1% ( 0.1) syslogd : do_setitimer (it_real_fn)

    A USB device is active 0.0% of the time:
    /sys/bus/usb/devices/3-2.3

    Suggestion: increase the VM dirty writeback time from 5.00 to 15 seconds
    with:
    echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
    This wakes the disk up less frequenty for background VM activity

    Suggestion: enable the noatime filesystem option by executing the
    following command:
    mount -o remount,noatime / or by pressing the T key
    noatime disables persistent access time of file accesses, which causes lots of disk IO.

    Suggestion: Disable 'hal' from polling your cdrom with:
    hal-disable-polling --device /dev/cdrom 'hal' is the component that auto-opens a
    window if you plug in a CD but disables SATA power saving from kicking in.

    Suggestion: Enable the CONFIG_CPU_FREQ_STAT kernel configuration option.
    This option allows PowerTOP to show P-state percentages
    P-states correspond to CPU frequencies.

    Suggestion: Enable the CONFIG_ACPI_BATTERY kernel configuration option.
    This option is required to get power estimages from PowerTOP

    Suggestion: Enable the CONFIG_CPU_FREQ_GOV_ONDEMAND kernel configuration option.
    The 'ondemand' CPU speed governor will minimize the CPU power usage while
    giving you performance when it is needed.

    Suggestion: Enable the CONFIG_USB_SUSPEND kernel configuration option.
    This option will automatically disable UHCI USB when not in use, and may
    save approximately 1 Watt of power.

    Recent USB suspend statistics
    Active Device name
    0.0% USB device usb5 : EHCI Host Controller (Linux 2.6.25 ehci_hcd)
    0.0% USB device usb4 : UHCI Host Controller (Linux 2.6.25 uhci_hcd)
    0.0% USB device 3-2.4 : USB Multimedia Keyboard (BTC)
    0.0% /sys/bus/usb/devices/3-2.3
    0.0% USB device 3-2 : Generic USB Hub (ALCOR)
    0.0% USB device usb3 : OHCI Host Controller (Linux 2.6.25 ohci_hcd)
    0.0% USB device usb2 : OHCI Host Controller (Linux 2.6.25 ohci_hcd)
    0.0% USB device usb1 : OHCI Host Controller (Linux 2.6.25 ohci_hcd)

    Thanks
    Guennadi
    ---
    Guennadi Liakhovetski, Ph.D.
    Freelance Open-Source Software Developer
    http://www.open-technology.de/


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