https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220198
Bug ID: 220198
Summary: igb stats double counting in 12-CURRENT
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
My networking statistics appear to be double counting on two of my FreeBSD
12-CURRENT boxes running r319025.
I discovered the double counting by comparing the output of "systat -ifstat"
(which reports 988 KB/s) with the output of "iftop -B" (which reports 491
KB/s). I believe systat uses the kernel interface counters to infer bandwidth
usage, whereas iftop gathers statistics using pcap. I know that iftop is the
correct one, because my internet speed only gives me around ~500 KB/s
unfortunately.
# systat -ifstat -match igb0
...
Interface Traffic Peak Total
igb0 in 988.008 KB/s 988.008 KB/s 36.295 GB
out 16.953 KB/s 16.953 KB/s 295.774 GB
# iftop -i igb0 -B
...
TX: cum: 31.7KB peak: 9.69KB rates: 9.69KB 7.92KB 7.92KB
RX: 1.54MB 491KB 491KB 394KB 394KB
The two interfaces in these boxes are:
$ pciconf -lvv | grep igb1 -A4
igb1@pci0:4:0:0: class=0x020000 card=0x00008086 chip=0x15398086 rev=0x03
hdr=0x00
vendor = 'Intel Corporation'
device = 'I211 Gigabit Network Connection'
class = network
subclass = ethernet
$ pciconf -lvv | grep igb0 -A4
igb0@pci0:8:0:0: class=0x020000 card=0x15331849 chip=0x15338086 rev=0x03
hdr=0x00
vendor = 'Intel Corporation'
device = 'I210 Gigabit Network Connection'
class = network
subclass = ethernet
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