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SubjectRe: 50 Watt idle power regression bisected to Linux-3.10
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As in it hangs at that point?

Mike Galbraith <bitbucket@online.de> wrote:
>On Wed, 2013-12-11 at 20:49 -0800, H. Peter Anvin wrote:
>> On 12/11/2013 08:25 PM, Mike Galbraith wrote:
>> > arch/x86/include/asm/mwait.h | 4 ++--
>> > arch/x86/kernel/cpu/common.c | 7 ++++---
>> > arch/x86/kernel/setup_percpu.c | 1 +
>> > 3 files changed, 7 insertions(+), 5 deletions(-)
>> >
>> > Index: linux-2.6/arch/x86/kernel/cpu/common.c
>> > ===================================================================
>> > --- linux-2.6.orig/arch/x86/kernel/cpu/common.c
>> > +++ linux-2.6/arch/x86/kernel/cpu/common.c
>> > @@ -65,13 +65,14 @@ void __init setup_cpu_local_masks(void)
>> > }
>> >
>> > /* allocate percpu area for mwait doorbell */
>> > -char __percpu *mwait_doorbell;
>> > +DEFINE_PER_CPU(char *, mwait_doorbell);
>> > +EXPORT_PER_CPU_SYMBOL(mwait_doorbell);
>> >
>>
>> Sorry, this is wrong. This is NOT a percpu variable, it is a pointer
>to
>> a percpu allocation, but the variable itself is not a percpu
>variable.
>> This explains your boom.
>
>With that fixed, it boots, but is not quite perfect.
>
>...
>[ 258.560079] fbcon: radeondrmfb (fb0) is primary device
>[ 258.722483] Console: switching to colour frame buffer device 128x48
>[ 258.847076] radeon 0000:01:03.0: fb0: radeondrmfb frame buffer
>device
>[ 258.911991] radeon 0000:01:03.0: registered panic notifier
>[ 258.968772] [drm] Initialized radeon 2.35.0 20080528 for
>0000:01:03.0 on minor 0
>...
>[ 469.738604] netxen_nic 0000:04:00.3: using msi-x interrupts
>[ 469.739078] netxen_nic 0000:04:00.3: eth5: GbE port initialized
>[ 469.830512] ipmi_si 00:01: Found new BMC (man_id: 0x00000b, prod_id:
>0x2000, dev_id: 0x13)
>[ 469.830524] ipmi_si 00:01: IPMI kcs interface initialized
>[ 473.729862] iTCO_wdt: unable to reset NO_REBOOT flag, device
>disabled by hardware/BIOS
>...
>[ 711.636741] fuse init (API version 7.22)
>
>...zzzz ok box, doctor appointment is in an hour away.
>
>-Mike

--
Sent from my mobile phone. Please pardon brevity and lack of formatting.


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