finding optimal ipfw strategy

[Victor Gamov]

On 24/08/2019 22:34, Eugene Grosbein wrote:
> 25.08.2019 1:13, Victor Gamov wrote:
> 
>> I have nonstandard network task for my FreeBSD box:
>> many VLANs bridged together via bridge interface and specific multicast traffic must be send
>> from one VLAN to many (but not all) other VLANs.
> 
> It is quite standard filtering bridge :-)

Hi All

More general question about my current config.  I have about 200Mbit 
input multicasts which bridged and filtered later (about 380 Mbit 
bridged if trafshow does not lie me :-) )

My FreeBSD box (12.0-STABLE r348449 GENERIC  amd64)  has one "Intel(R) 
Xeon(R) CPU E31270 @ 3.40GHz"  and 4-ports  "Intel(R) PRO/1000 
PCI-Express Network Driver".  HT disabled and traffic mainly income via 
igb0 and out both via igb0 and igb2.  About 30 VLANs now active some at 
igb0 and some at igb2.


And I have following `top` stat:
=====
CPU 0:  0.0% user,  0.0% nice, 80.5% system,  0.0% interrupt, 19.5% idle
CPU 1:  0.0% user,  0.0% nice, 34.1% system,  0.0% interrupt, 65.9% idle
CPU 2:  0.0% user,  0.0% nice, 17.1% system,  0.0% interrupt, 82.9% idle
CPU 3:  0.0% user,  0.0% nice, 46.3% system,  0.0% interrupt, 53.7% idle
=====

Also `vmstat -i |grep igb`:
=====
irq264: igb0:rxq0             9310734762       5471
irq265: igb0:rxq1            10186691956       5985
irq266: igb0:rxq2             8190475727       4812
irq267: igb0:rxq3            10063786697       5913
irq268: igb0:aq                       34          0
irq273: igb1:aq                        1          0
irq274: igb2:rxq0            11010248236       6469
irq275: igb2:rxq1            10843712062       6371
irq276: igb2:rxq2             8810194905       5177
irq277: igb2:rxq3            10975949272       6449
irq278: igb2:aq                       10          0
irq283: igb3:aq                        1          0
=====


Is it possible to get CPU load about 30% at this config after ipfw 
optimization?  Or may be main bottleneck is not ipfw-specific?


--
CU,
Victor Gamov