disk and NIC io statistics via sysctl

[Stefan Parvu]

Hi, 

Fetching CPU and Memory statistics, using sysctl interface and perl seems nice and easy.
I made great progress with sysrec a generic recorder reporting: cpu mem disk and nic 
stats on FreeBSD. Now Im getting into disk and nic sections:

1. Disk 
Im able to get a list of all disks on a system using kern.disks sysctl variable.
I want to be able to report per disk something like:

 	readreq 	rate 	read requests per second, rate
 	writereq 	rate 	write requests per second, rate
 	totreq 	rate 	total read + write requests per second, rate
 	readbyt 	rate 	read bytes per second, in KB, rate
 	writebyt 	rate 	write bytes per second, in KB, rate
 	totbyt 	rate 	total read + write bytes per second, in KB, rate 

iostat seems the simplest way to fetch these, but how about sysctl interface ?
I could not figure out any sysctl parameters for disk throughput. How one will 
fetch throughput per disk via sysctl ? 


2. NIC
Same will go for network card interfaces. I want to fetch per NIC throughput and
errors via sysctl, something like these:

1 	timestamp 	time 	seconds since Epoch
2 	interface 	number 	NIC name, string
3 	rxKB 	rate 	the number of KBytes received per sec
4 	rxpcks 	rate 	the no. of packets received per sec
5 	rxerrs 	rate 	the number of errors while received packets per sec
6 	rxdrop 	rate 	the number of packets that were dropped per sec
7 	rxfifo 	rate 	the number of FIFO overruns on received packets per sec
8 	rxframe 	rate 	the number of carrier errors on received packet per sec
9 	rxcompr 	rate 	the number of compressed packets received per sec
10 	rxmulti 	rate 	the number of multicast packets received per sec
11 	txKB 	rate 	the number of KBytes transmitted per sec
12 	txpcks 	rate 	the number of packets transmitted per sec
13 	txerrs 	rate 	the number of errors transmitting packets per sec
14 	txdrop 	rate 	the number of packets that were dropped per sec
15 	txfifo 	rate 	the number of FIFO overruns on transmitted packets per sec
16 	txcolls 	rate 	the number of collisions that were detecte per sec
17 	txcarr 	rate 	the number of carrier errors on transmitted packets per sec
18 	txcompr 	rate 	the number of compressed packets transmitted per sec
19 	ttpcks 	rate 	the total number of packets (received + transmitted) per sec
20 	ttKB 	rate 	the total number of KBytes (received + transmitted) per sec 


Any ideas ?

Many thanks,

-- 
Stefan Parvu <sparvu at systemdatarecorder.org>