netdev - Re: stmmac / meson8b-dwmac

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Date:   Wed, 27 Feb 2019 22:03:47 +0100
From:   Simon Huelck <simonmail@....de>
To:     Jose Abreu <jose.abreu@...opsys.com>,
        Sebastian Gottschall <s.gottschall@...media-net.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     linux-amlogic@...ts.infradead.org, Gpeppe.cavallaro@...com,
        alexandre.torgue@...com,
        Emiliano Ingrassia <ingrassia@...genesys.com>,
        netdev@...r.kernel.org
Subject: Re: stmmac / meson8b-dwmac

Hi,


i got another question about NAPI and irq assignment.


my ethernet IRQ is assigned to CPU3:

           CPU0       CPU1       CPU2       CPU3
  1:          0          0          0          0     GICv2  25 Level    
vgic
  3:    7265279    3145278    4626601    2454147     GICv2  30 Level    
arch_timer
  4:          0          0          0          0     GICv2  27 Level    
kvm guest vtimer
  6:          0          0          0          0     GICv2 169 Level    
arm-pmu
  7:          0          0          0          0     GICv2 170 Level    
arm-pmu
  8:          0          0          0          0     GICv2 185 Level    
arm-pmu
  9:          0          0          0          0     GICv2 186 Level    
arm-pmu
 10:          0          0          0          0     GICv2  53 Edge     
c1108500.i2c
 11:          3          0          0          0     GICv2 105 Edge     
c1108680.adc
 13:       1229          0          0          0     GICv2 225 Edge     
ttyAML0
 14:        334          0          0          0     GICv2 228 Edge     
c8100580.ir
 --> 18:        498          0     104034   19348144     GICv2  40
Level     eth0
 19:       4500     331407          0          0     GICv2 249 Edge     
d0072000.mmc
 20:         13          0          0          0     GICv2 250 Edge     
d0074000.mmc
 31:          0          0          0          0     GICv2  35 Edge     
meson
 32:          0          0          0          0     GICv2  89 Edge     
dw_hdmi_top_irq, c883a000.hdmi-tx
 34:     140014          0 2264814045          0     GICv2  63 Level    
c9100000.usb, dwc2_hsotg:usb1
IPI0:   3195735    3384376    2748050    4076544       Rescheduling
interrupts
IPI1:   1683557     683651   15136522        135       Function call
interrupts
IPI2:         0          0          0          0       CPU stop interrupts
IPI3:         0          0          0          0       CPU stop (for
crash dump) interrupts
IPI4:         0          0          0          0       Timer broadcast
interrupts
IPI5:         6         20        517          0       IRQ work interrupts
IPI6:         0          0          0          0       CPU wake-up
interrupts
Err:          0



but when checking the softirqs i see that work is distributed over all
CPUs, is this normal ?

                    CPU0       CPU1       CPU2       CPU3
          HI:          0          0          0          1
       TIMER:    6513467    1258789    1058072    2181809
      NET_TX:     574886     708816    1820739     140379
      NET_RX:    1882454     920141   15537594   34834596
       BLOCK:       3369      14936       3008       2389
    IRQ_POLL:          0          0          0          0
     TASKLET:     512404     626201   20054827     192419
       SCHED:    5946453    1067624     777568    1916812
     HRTIMER:          0          0          0          0
         RCU:    1934215     719530     867003     876727


regards,

Simon