Re: [Xen-devel] XEN increases idle power consumption by 25%

[Martin Meier <martin4meier@xxxxxxxxxxxxxx>]

On Mon, Aug 29, 2011 at 10:09 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Mon, Aug 29, 2011 at 05:30:58PM +0200, Martin Meier wrote:
>> On Thu, Aug 25, 2011 at 12:25 AM, Konrad Rzeszutek Wilk
>> <konrad.wilk@xxxxxxxxxx> wrote:
>>
>> > And you can test the xen-cpu-idle patches in #testing if you are up for
>> > seeing if that is the cause of your power consumption issues.
>> >
>> > git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git #testing
>>
>> OK, I switched from 3.1-rc2 to your 3.0.3 kernel - I now see ~23W w/
>> or w/o xen :-)
>
> Ok, so that is the #master branch right? And ~23W was what you wanted
> right?

Yes, and yes.

I tried #testing today and it worked OK, too.

FYI, after a minor change to the kernel .config:

-CONFIG_ACPI_PROCESSOR=y
+CONFIG_ACPI_PROCESSOR=m

-CONFIG_ACPI_PROCESSOR_XEN=y
+CONFIG_ACPI_PROCESSOR_XEN=m

I noticed this:

[   11.698368] ------------[ cut here ]------------
[   11.698386] WARNING: at drivers/cpuidle/driver.c:62
cpuidle_unregister_driver+0x2a/0x61()
[   11.698392] Hardware name:
[   11.698396] invalid cpuidle_unregister_driver(acpi_idle)
[   11.698400] Modules linked in: processor(+) snd evdev soundcore
i2c_i801 rtc_cmos psmouse pcspkr serio_raw acpi_processor
snd_page_all]
[   11.698451] Pid: 560, comm: modprobe Tainted: G         C
3.1.0-rc4-konrad-1+ #17
[   11.698456] Call Trace:
[   11.698465]  [<ffffffff810587c3>] warn_slowpath_common+0x80/0x98
[   11.698471]  [<ffffffffa0117000>] ? 0xffffffffa0116fff
[   11.698501]  [<ffffffff8105886f>] warn_slowpath_fmt+0x41/0x43
[   11.698508]  [<ffffffff8132959b>] cpuidle_unregister_driver+0x2a/0x61
[   11.698516]  [<ffffffffa01170e3>] acpi_processor_init+0xe3/0xe8 [processor]
[   11.698524]  [<ffffffff8100207a>] do_one_initcall+0x7a/0x150
[   11.698531]  [<ffffffff8108d968>] sys_init_module+0x7e/0x1c7
[   11.698539]  [<ffffffff813de7d2>] system_call_fastpath+0x16/0x1b
[   11.698543] ---[ end trace f1b3f5c476845ee5 ]---

and a high idle power consumption again.

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