[Bug 213439] ifOutOctets are always zero for Xen xn interfaces

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213439

--- Comment #4 from Trond.Endrestol at ximalas.info ---
(In reply to Andrey V. Elsukov from comment #2)

I tried the second proposed patch on an identical and least busy system:

root@[WITHHELD]:~ # uname -a
FreeBSD [WITHHELD] 11.0-STABLE FreeBSD 11.0-STABLE #2 r307213M: Thu Oct 13
16:28:54 CEST 2016     root@[WITHHELD]:/usr/obj/usr/src/sys/XENGUEST  amd64

root@[WITHHELD]:~ # snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.2.2
IF-MIB::ifDescr.2 = STRING: xn0
root@[WITHHELD]:~ # snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.10.2
IF-MIB::ifInOctets.2 = Counter32: 29079
root@[WITHHELD]:~ # snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.16.2
IF-MIB::ifOutOctets.2 = Counter32: 24659

root@[WITHHELD]:~ # snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.2.3
IF-MIB::ifDescr.3 = STRING: xn1
root@[WITHHELD]:~ # snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.10.3
IF-MIB::ifInOctets.3 = Counter32: 10450
root@[WITHHELD]:~ # snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.16.3
IF-MIB::ifOutOctets.3 = Counter32: 696

After running for a while, I got this:


root@[WITHHELD]:~ # snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.2.2 ;
snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.10.2 ; snmpget -v 2c -c
public localhost 1.3.6.1.2.1.2.2.1.16.2
IF-MIB::ifDescr.2 = STRING: xn0
IF-MIB::ifInOctets.2 = Counter32: 115769
IF-MIB::ifOutOctets.2 = Counter32: 117953

root@[WITHHELD]:~ # snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.2.3 ;
snmpget -v 2c -c public localhost 1.3.6.1.2.1.2.2.1.10.3 ; snmpget -v 2c -c
public localhost 1.3.6.1.2.1.2.2.1.16.3
IF-MIB::ifDescr.3 = STRING: xn1
IF-MIB::ifInOctets.3 = Counter32: 67898
IF-MIB::ifOutOctets.3 = Counter32: 696

The low count on ifOutOctets.3 is due to pf filtering and low activity on the
xn1 interface.

This patch looks promising. I guess this patch can be committed after some more
testing.

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