Re: [Xen-devel] Only CPU0 active after ACPI S3, xen 4.1.3

[Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On 03.01.2013 09:52, Jan Beulich wrote:
>>>> On 21.12.12 at 14:33, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
> wrote:
>> On 21.12.2012 09:55, Jan Beulich wrote:
>>>>>> On 21.12.12 at 05:52, Marek Marczykowski 
>>>>>> <marmarek@xxxxxxxxxxxxxxxxxxxxxx> 
>> wrote:
>>>> On 21.12.2012 00:17, Marek Marczykowski wrote:
>>>>> With this patch applied (on 4.1.4 and 4.3-unstable), I've got original 
>>>> symptom
>>>>> - only CPU0 active after ACPI S3. Didn't get reboot after few tries.
>>>>> "xl debug-key r" output attached.
>>>>> Anyway it looks like bug was introduced somehow between 4.1.2 and 4.1.3 - 
>>>>> on
>>>>> 4.1.2 none of above problems happened.
>>>>
>>>> I've done bisect on xen 4.1 and found problematic commit:
>>>> http://xenbits.xen.org/hg/xen-4.1-testing.hg/rev/1f95b55ef427 
>>>
>>> In that case, using "sched_ratelimit_us=0" should make the
>>> problem go away again - did you try that?
>>
>> This option does not help when trying 4.1.4, but does when trying xen 
>> compiled from above c/s.
> 
> Are you saying that on 4.1.4 this doesn't take effect? Are there
> any log messages indicating so? The above being the top most
> change to sched_credit.c, this difference in behavior pretty odd.

I can no longer reproduce this bug on 4.1.3-rc1-pre (above sched_credit c/s)
with or without sched_ratelimit_us=0. So it must be some mistake during
previous testing.
Also the problem from email subject is rather rare and not observed after ~20
suspend-resume cycles...

Just to summary:
4.1.3-rc1-pre (above sched_credit c/s) - works ok
4.1.4 regardless of sched_ratelimit_us=0 reboots at resume
4.1.5-pre reboots at resume regardless of sched_ratelimit_us option
4.1.5-pre with "Introduce system_state variable" reverted works fine -
regardless of sched_ratelimit_us option

"4.1.5-pre" was c/s 23436:2ae6267371d8, but still the same effects on
23441:2a91623a5807.

> On 4.2, this wouldn't be surprising, given that without -unstable
> c/s 26266:8d209624ea83 the =0 special case didn't get handled
> (broken by 24880:dd9e8f1ebed1).
> 
> Jan
> 


-- 
Best Regards / Pozdrawiam,
Marek Marczykowski
Invisible Things Lab

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