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Re: ifconfig v2
On Jun 12, 2013, at 06:05 , Mouse <mouse%Rodents-Montreal.ORG@localhost> wrote:
> Personally, I don't think the traffic-rate stuff belongs in the kernel.
> I'd prefer to see that implemented in netstat by sampling stats twice
> with a measured delay and doing the arithmetic there. In aid of doing
> this with very short delays, I'd say it would be good to make network
> stats come back from the kernel with a timestamp attached. "Mechanism,
> not policy."
Uh, "load average"?
An example "show interface" output from a Cisco route server:
Ethernet1/0 is up, line protocol is up
Hardware is AmdP2, address is 0050.73d0.cd1c (bia 0050.73d0.cd1c)
Description: "mdf001ffisxs0003.lax1 e4/24"
Internet address is 220.127.116.11/29
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 2 drops, 184 flushes
5 minute input rate 2000 bits/sec, 3 packets/sec
5 minute output rate 2000 bits/sec, 3 packets/sec
144626276 packets input, 3744307030 bytes, 0 no buffer
Received 100821 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
157988942 packets output, 624419973 bytes, 0 underruns
0 output errors, 108111 collisions, 0 interface resets
0 babbles, 0 late collision, 393433 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Cisco has used "five minutes" for their rate average for as long as I can
remember. Akin to Unix's three load averages: 1 min, 5 min, 15 min, maintained
by our kernel clock interrupt handler.
Given that Unix still doesn't distinguish between output queue limit drops and
mbuf exhaustion drops (see PR kern/7285 http://gnats.netbsd.org/7285 ),
reporting of I/F queue drops in the netstat -i display seems prudent, too, as
you see above.
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