26.08.2019 23:25, Victor Gamov wrote:

> 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 :-) )

Don't trust trafshow. Use: systat -ifstat 1

> 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?

You won't know until you try and nobody can tell. Too many variables.
And you better compare it with 11.3 because 12.0 may have some unsolved 
preformance regressions.

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