Howto check fast I/O, speed

[root@oGcServ ~]# wget cachefly.cachefly.net/100mb.test -O /dev/null
--2011-09-01 03:48:23-- http://cachefly.cachefly.net/100mb.test
Resolving cachefly.cachefly.net... 205.234.175.175
Connecting to cachefly.cachefly.net|205.234.175.175|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 104857600 (100M) [application/octet-stream]
Saving to: `/dev/null'
100%[==========================================] 104,857,600 83.5M/s in 1.2s
2011-09-01 03:48:25 (83.5 MB/s) - `/dev/null' saved [104857600/104857600]


[root@oGcServ ~]# dd if=/dev/zero of=test.file bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 17.6911 seconds, 60.7 MB/s
[root@oGcServ ~]#


Note: for BSD exclude 'condv=fdatasync'