netisr defered - active only one thread

[Andrey Zonov]

Hi,

I'm trying to tune machine with 8.2-STABLE for heavy network load and 
now playing with netisr.  Could anyone explain me why actually works 
only one netisr thread if I set them to 8?

loader.conf:
net.isr.maxthreads=8
net.isr.bindthreads=0 (also tried set to 1)
hw.em.rxd=4096

(net.isr.numthreads is 8 after reboot, `procstat -t 12' shows me 8 
netisr threads)

sysctl.conf:
net.isr.direct=0
net.isr.direct_force=0 (also tried hybrid mode when direct=1, but 
force_direct=0)

NIC:
em0 at pci0:4:0:0: class=0x020000 card=0x109615d9 chip=0x10968086 rev=0x01 
hdr=0x00
     vendor     = 'Intel Corporation'
     device     = 'Intel PRO/1000 EB (Intel PRO/1000 EB)'
     class      = network
     subclass   = ethernet

No polling.

top:
   PID USERNAME      PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
    12 root          -44    -     0K   512K CPU7    7   1:18 100.00% 
{swi1: netisr 7}
    11 root          171 ki31     0K   128K CPU3    3   2:15 94.38% 
{idle: cpu3}
    11 root          171 ki31     0K   128K CPU6    6   2:06 90.19% 
{idle: cpu6}
    11 root          171 ki31     0K   128K CPU2    2   2:42 88.67% 
{idle: cpu2}
    11 root          171 ki31     0K   128K CPU1    1   2:22 84.18% 
{idle: cpu1}
    11 root          171 ki31     0K   128K CPU5    5   2:29 75.29% 
{idle: cpu5}
    11 root          171 ki31     0K   128K RUN     4   2:28 69.97% 
{idle: cpu4}
    11 root          171 ki31     0K   128K RUN     0   2:29 69.68% 
{idle: cpu0}

-- 
Andrey Zonov