Mailinglist Archive: opensuse-mobile (24 mails)
| < Previous | Next > |
Re: [opensuse-mobile] Question on power consumption of zen-updater and opensuseupdater / kernel - powersaving options
- From: Dieter Jurzitza <dieter.jurzitza@xxxxxxxxxxx>
- Date: Wed, 25 Jul 2007 13:47:49 +0200
- Message-id: <200707251347.50177.dieter.jurzitza@xxxxxxxxxxx>
Dear Thomas,
dear listmembers,
I know I owe answers (specifically to Thomas), so here you go:
"Stock" kernel 2.6.21-185 (not in use any more, stem from kernel repositories
at that time:
Backlight full power, ipw3945 full power mode:
15,7 Watts power consumption (average)
"Modified" kernel 2.6.21-190 (derived from above, only the following options
activated:
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_USB_SUSPEND=y
CONFIG_TIMER_STATS=y
Backlight full power, ipw3945 full power mode:
12,6 Watts.
Backlight full power, ipw3945 in low power consumption mode:
11,4 Watts.
Backlight totally dimmed and ipw3945 in low power mode:
9,5 Watts
so yes, you were right, the kernel options are not _that_ effective. But three
Watts still remain an impressive value. What you say about stability of the
kernel options - well, I can tell for my laptop only that since the day I
switched to this kernel including the options mentioned above I haven't seen
a single crash - the issues I had been facing before were mainly related to
suspend issues.
Nevertheless from my limited scope of view these options seem to do no harm -
and a commenter in the wiki said that Ubuntu and Fedora would acitvate them
by default.
What regards the loading induced by zen-updater and opesuseupdater I will
provide a follow-up soon.
And, sorry, it would take tons of time to rebuild the kernel with each option
activated separately to distinguish what contributes how much. If there is no
urgent need for this I would be glad if you can survive without that
information. Come back to me if you really really need it - and tell me the
activation sequence you'd want to see.
Hope this helps, sorry for the delay,
take care
Dieter
Am Dienstag, 10. Juli 2007 19:54 schrieb Thomas Renninger:
****
> Could you give us a pointer what kind of events happen how often, pls.
> And how they keep loading the battery. Through not going into Cx state
> Is it really that much?
> What have you modified?
> Simply booting the one or the other kernel saves you that much (-> I
> doubt that)?
> Do you use an USB mouse/keyboard that gets autosuspended with the other
> kernel?
*****
--
-----------------------------------------------------------
|
\
/\_/\ |
| ~x~ |/-----\ /
\ /- \_/
^^__ _ / _ ____ /
<°°__ \- \_/ | |/ | |
|| || _| _| _| _|
if you really want to see the pictures above - use some font
with constant spacing like courier! :-)
-----------------------------------------------------------
---------------------------------------------------------------------
To unsubscribe, e-mail: opensuse-mobile+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: opensuse-mobile+help@xxxxxxxxxxxx
dear listmembers,
I know I owe answers (specifically to Thomas), so here you go:
"Stock" kernel 2.6.21-185 (not in use any more, stem from kernel repositories
at that time:
Backlight full power, ipw3945 full power mode:
15,7 Watts power consumption (average)
"Modified" kernel 2.6.21-190 (derived from above, only the following options
activated:
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_USB_SUSPEND=y
CONFIG_TIMER_STATS=y
Backlight full power, ipw3945 full power mode:
12,6 Watts.
Backlight full power, ipw3945 in low power consumption mode:
11,4 Watts.
Backlight totally dimmed and ipw3945 in low power mode:
9,5 Watts
so yes, you were right, the kernel options are not _that_ effective. But three
Watts still remain an impressive value. What you say about stability of the
kernel options - well, I can tell for my laptop only that since the day I
switched to this kernel including the options mentioned above I haven't seen
a single crash - the issues I had been facing before were mainly related to
suspend issues.
Nevertheless from my limited scope of view these options seem to do no harm -
and a commenter in the wiki said that Ubuntu and Fedora would acitvate them
by default.
What regards the loading induced by zen-updater and opesuseupdater I will
provide a follow-up soon.
And, sorry, it would take tons of time to rebuild the kernel with each option
activated separately to distinguish what contributes how much. If there is no
urgent need for this I would be glad if you can survive without that
information. Come back to me if you really really need it - and tell me the
activation sequence you'd want to see.
Hope this helps, sorry for the delay,
take care
Dieter
Am Dienstag, 10. Juli 2007 19:54 schrieb Thomas Renninger:
****
> Could you give us a pointer what kind of events happen how often, pls.
> And how they keep loading the battery. Through not going into Cx state
> Is it really that much?
> What have you modified?
> Simply booting the one or the other kernel saves you that much (-> I
> doubt that)?
> Do you use an USB mouse/keyboard that gets autosuspended with the other
> kernel?
*****
--
-----------------------------------------------------------
|
\
/\_/\ |
| ~x~ |/-----\ /
\ /- \_/
^^__ _ / _ ____ /
<°°__ \- \_/ | |/ | |
|| || _| _| _| _|
if you really want to see the pictures above - use some font
with constant spacing like courier! :-)
-----------------------------------------------------------
---------------------------------------------------------------------
To unsubscribe, e-mail: opensuse-mobile+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: opensuse-mobile+help@xxxxxxxxxxxx
| < Previous | Next > |