* Only 1 cpu scheduled in 4.2.0
@ 2015-09-02 9:38 Martin van Es
2015-09-02 10:50 ` Mike Galbraith
0 siblings, 1 reply; 5+ messages in thread
From: Martin van Es @ 2015-09-02 9:38 UTC (permalink / raw)
To: Linux Kernel Mailing List
Hi,
I recently compiled 4.2.0 based on my previous 4.1.6 config (make oldconfig).
On 4.1.6 all cores are equally scheduled.
This new 4.2.0 kernel however only schedules cpu0 on my 4 cpu i7-3537U
(which is actually 2 cores x 2HT, as far as I understand the specs).
CPU1 is scheduled for 0.5% now and then, so it's not completely 0.
I tried (re)enabling NUMA support, since that's adviced for 64bit/i7
cpu's according to the help text, but that didn't change anything.
Did I miss a new option for SMP scheduling in 4.2.0?
Best regards,
Martin
--
If 'but' was any useful, it would be a logic operator
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Only 1 cpu scheduled in 4.2.0
2015-09-02 9:38 Only 1 cpu scheduled in 4.2.0 Martin van Es
@ 2015-09-02 10:50 ` Mike Galbraith
2015-09-02 11:35 ` Martin van Es
0 siblings, 1 reply; 5+ messages in thread
From: Mike Galbraith @ 2015-09-02 10:50 UTC (permalink / raw)
To: Martin van Es; +Cc: Linux Kernel Mailing List
On Wed, 2015-09-02 at 11:38 +0200, Martin van Es wrote:
> Hi,
>
> I recently compiled 4.2.0 based on my previous 4.1.6 config (make oldconfig).
> On 4.1.6 all cores are equally scheduled.
Do you have CONFIG_NO_HZ_FULL_ALL enabled?
-Mike
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Only 1 cpu scheduled in 4.2.0
2015-09-02 10:50 ` Mike Galbraith
@ 2015-09-02 11:35 ` Martin van Es
2015-09-02 11:44 ` Mike Galbraith
0 siblings, 1 reply; 5+ messages in thread
From: Martin van Es @ 2015-09-02 11:35 UTC (permalink / raw)
To: Mike Galbraith; +Cc: Linux Kernel Mailing List
On Wed, Sep 2, 2015 at 12:50 PM, Mike Galbraith
<umgwanakikbuti@gmail.com> wrote:
> On Wed, 2015-09-02 at 11:38 +0200, Martin van Es wrote:
>> Hi,
>>
>> I recently compiled 4.2.0 based on my previous 4.1.6 config (make oldconfig).
>> On 4.1.6 all cores are equally scheduled.
>
> Do you have CONFIG_NO_HZ_FULL_ALL enabled?
Yes, that's enabled.
Martin
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Only 1 cpu scheduled in 4.2.0
2015-09-02 11:35 ` Martin van Es
@ 2015-09-02 11:44 ` Mike Galbraith
2015-09-02 14:49 ` Martin van Es
0 siblings, 1 reply; 5+ messages in thread
From: Mike Galbraith @ 2015-09-02 11:44 UTC (permalink / raw)
To: Martin van Es; +Cc: Linux Kernel Mailing List
On Wed, 2015-09-02 at 13:35 +0200, Martin van Es wrote:
> On Wed, Sep 2, 2015 at 12:50 PM, Mike Galbraith
> <umgwanakikbuti@gmail.com> wrote:
> > On Wed, 2015-09-02 at 11:38 +0200, Martin van Es wrote:
> >> Hi,
> >>
> >> I recently compiled 4.2.0 based on my previous 4.1.6 config (make oldconfig).
> >> On 4.1.6 all cores are equally scheduled.
> >
> > Do you have CONFIG_NO_HZ_FULL_ALL enabled?
>
> Yes, that's enabled.
Turn it off and you'll get your CPUs back.
-Mike
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Only 1 cpu scheduled in 4.2.0
2015-09-02 11:44 ` Mike Galbraith
@ 2015-09-02 14:49 ` Martin van Es
0 siblings, 0 replies; 5+ messages in thread
From: Martin van Es @ 2015-09-02 14:49 UTC (permalink / raw)
To: Mike Galbraith; +Cc: Linux Kernel Mailing List
On Wed, Sep 2, 2015 at 1:44 PM, Mike Galbraith <umgwanakikbuti@gmail.com> wrote:
> On Wed, 2015-09-02 at 13:35 +0200, Martin van Es wrote:
>> On Wed, Sep 2, 2015 at 12:50 PM, Mike Galbraith
>> <umgwanakikbuti@gmail.com> wrote:
>> > On Wed, 2015-09-02 at 11:38 +0200, Martin van Es wrote:
>> >> Hi,
>> >>
>> >> I recently compiled 4.2.0 based on my previous 4.1.6 config (make oldconfig).
>> >> On 4.1.6 all cores are equally scheduled.
>> >
>> > Do you have CONFIG_NO_HZ_FULL_ALL enabled?
>>
>> Yes, that's enabled.
>
> Turn it off and you'll get your CPUs back.
Yay, all my CPU's are rumbling again!
Thx!
Martin
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2015-09-02 14:49 UTC | newest]
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2015-09-02 9:38 Only 1 cpu scheduled in 4.2.0 Martin van Es
2015-09-02 10:50 ` Mike Galbraith
2015-09-02 11:35 ` Martin van Es
2015-09-02 11:44 ` Mike Galbraith
2015-09-02 14:49 ` Martin van Es
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