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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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