[Queueing Packets with ALTQ on Gigabit Fiber Optic and Gigabit Ethernet]

Diego Salvador salvador_d13 at yahoo.com.ph
Fri Jun 20 12:52:26 UTC 2008


Hi,

Is there any difference in handling packet queues with ALTQ if the network card is
a Gigabit fiber network interface and a Gigabit Ethernet network interface with the
same driver? For example (em) driver for Intel-based cards. I'm currently having a
system configured with FreeBSD-6.2 RELEASE with PF and ALTQ enabled. This
host is configured first with Intel 1-Gigabit Ethernet network card and when it
receive big amount of traffic, I don't see any packet errors with netstat but when I
switched to the 1-Gigabit fiber optic card, I could see packet errors with this
interface. A big amount of traffic were bombarded on the interface around
800Mbps.

Here's the sample packet errors received on the system with netstat.

Gigabit Intel fiber interface
-------------------------------------
# netstat -I em0 -w 1
           input          (em0)           output
   packets  errs      bytes    packets  errs      bytes colls
      3260 149652    2547816          0     0          0     0 
      3257 150026    2547756          0     0          0     0 
      3258 150117    2543396          1     0         42     0 
      3259 150181    2549320          0     0          0     0 
      3256 149941    2543244          0     0          0     0 
      3370 149871    2636122          0     0          0     0 
      3255 149534    2544688          0     0          0     0 
      3255 150077    2543966          0     0          0     0 
      3260 150195    2549320          0     0          0     0 
      3259 149603    2547816          0     0          0     0 
      3258 149746    2546312          0     0          0     0 
      3258 149855    2547756          0     0          0     0 
      3261 149851    2549320          0     0          0     0 
      3255 150414    2545410          0     0          0     0 
      3250 149758    2542282          0     0          0     0 
      3255 149842    2545410          0     0          0     0 
      3259 149568    2547756          0     0          0     0 
      3255 149943    2545502          0     0          0     0 
      3261 149893    2548658          0     0          0     0 
      3257 149581    2545530          0     0          0     0 

Thank you very much!

Diego

       
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