fyi: 11.0-current rpi2 systat -vmstat shows around 24k interrupts for bcm283x_dw

[Mark Millard]

Context:

> # freebsd-version -ku; uname -aKU
> 11.0-CURRENT
> 11.0-CURRENT
> FreeBSD rpi2 11.0-CURRENT FreeBSD 11.0-CURRENT #2 r292413M: Fri Dec 25 18:03:19 PST 2015     root at FreeBSDx64:/usr/obj/clang/arm.armv6/usr/src/sys/RPI2-NODBG  arm 1100091 1100091


For a basically near-idle context systat -vmstat lists "Int" and 23k to 25k normally (almost always 24k) and bcm283x_dw at the right shows figures like 24118. "generic_ti" is more like 232 and "ipi 76" is more like 111. The others at the right are normally blank (other than total).

Lots of bcm283x_dw interrupts if around 24k is correct. As the numbers do not change scale when the systat refresh interval is explicitly scaled, I assume that the figures are per second (or per some other time unit, possibly just for the most recent unit instead of mean).

I'm not sure it will be readable but the below is a capture of a systat -vmstat display.


>     2 users    Load  0.01  0.02  0.00                  Dec 26 20:33
> 
> Mem:KB    REAL            VIRTUAL                       VN PAGER   SWAP PAGER
>         Tot   Share      Tot    Share    Free           in   out     in   out
> Act   29944    6384   199516     7404   27876  count
> All   34164    8100   225364    26156          pages      
> Proc:                                                            Interrupts
>   r   p   d   s   w   Csw  Trp  Sys  Int  Sof  Flt        ioflt 24461 total
>              23       502    6   36  24k  100             cow         mbox0 1
>                                                           zfod        vchiq0 2
>  0.1%Sys   0.0%Intr  0.0%User  0.0%Nice 99.8%Idle         ozfod 24118 bcm283x_dw
> |    |    |    |    |    |    |    |    |    |           %ozfod       bcm_dma0
>                                                           daefr       uart0 65
>                                          8 dtbuf          prcfr       sdhci_bcm0
> Namei     Name-cache   Dir-cache     64790 desvn          totfr   232 generic_ti
>    Calls    hits   %    hits   %     64150 numvn          react   111 ipi 76
>        3       3 100                 38416 frevn          pdwak
>                                                         1 pdpgs
> Disks mmcsd   md0   da0                                   intrn
> KB/t   0.00  0.00  0.00                            195896 wire
> tps       0     0     0                              2620 act
> MB/s   0.00  0.00  0.00                            711648 inact
> %busy     0     0     0                                   cache
>                                                     27876 free
>                                                     88292 buf



===
Mark Millard
markmi at dsl-only.net