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. LinAdmin
