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Re: Problems using stock kernel armmp with Marvell 38x hardware.

On 19.10.2018 23:35, Reco wrote:
> 	Hi.
> On Fri, Oct 19, 2018 at 11:25:47PM +0200, LinAdmin wrote:
>> On 19.10.2018 20:12, Uwe Kleine-König wrote:
>>> Hello,
>>> On 10/19/2018 04:39 PM, LinAdmin wrote:
>>>> When the system is idle, one CPU is always busy at least 50%
>>>> with a kworker thread which IMHO does not perform any useful
>>>> work. When idle, the kernel 4.9.y built exclusively for
>>>> Marvell has both CPU’s at below 1% load.
>>> How do you diagnose that? I have an Turris Omnia here which is powered
>>> by an Armada385, too. I just logged into it, the load average is below
>>> 0.1 and according to htop the CPUs run at < 1%.
>>> Best regards
>>> Uwe
>> Using top or htop show that cpu load.
> What about 'perf top' result?
> I happen to have Armada385/Caiman with stock Debian kernel, and I see no
> such CPU load.
> Reco

Many thanks for hinting towards perf!

perf top shows on armmp:

Overhead  Shared Object  Symbol
86.45%      [kernel]            [k]armada_370_delay_timer_read
8.73%        [kernel]            [k] __timer_delay

With the dedicated kernel those high percentages do not show up.


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