======== FreeBSD ======== $ wget -O /dev/null http://cachefly.cachefly.net/400mb.test converted 'http://cachefly.cachefly.net/400mb.test' (US-ASCII) -> 'http://cachefly.cachefly.net/400mb.test' (UTF-8) --2015-01-14 13:22:49-- http://cachefly.cachefly.net/400mb.test Resolving cachefly.cachefly.net (cachefly.cachefly.net)... 205.234.175.175 Connecting to cachefly.cachefly.net (cachefly.cachefly.net)|205.234.175.175|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 419430400 (400M) [application/octet-stream] Saving to: '/dev/null' /dev/null 100%[==============================================================================>] 400.00M 41.1MB/s in 9.0s Network information: virtio_pci0@pci0:0:3:0: class=0x020000 card=0x00011af4 chip=0x10001af4 rev=0x00 hdr=0x00 vendor = 'Red Hat, Inc' device = 'Virtio network device' class = network subclass = ethernet $ time (dd if=/dev/zero of=/tmp/test bs=64k count=16k > /dev/null; sync) 16384+0 records in 16384+0 records out 1073741824 bytes transferred in 59.982561 secs (17900900 bytes/sec) real 1m0.005s user 0m0.063s sys 0m6.019s virtio_pci1: host features: 0x71000cd4 $ sudo diskinfo -ctv /dev/gpt/rootfs /dev/gpt/rootfs 512 # sectorsize 21474836480 # mediasize in bytes (20G) 41943040 # mediasize in sectors 0 # stripesize 1073759744 # stripeoffset 41610 # Cylinders according to firmware. 16 # Heads according to firmware. 63 # Sectors according to firmware. # Disk ident. I/O command overhead: time to read 10MB block 0.030893 sec = 0.002 msec/sector time to read 20480 sectors 2.032032 sec = 0.099 msec/sector calculated command overhead = 0.098 msec/sector Seek times: Full stroke: 250 iter in 0.052274 sec = 0.209 msec Half stroke: 250 iter in 0.052928 sec = 0.212 msec Quarter stroke: 500 iter in 0.100601 sec = 0.201 msec Short forward: 400 iter in 0.080569 sec = 0.201 msec Short backward: 400 iter in 0.081880 sec = 0.205 msec Seq outer: 2048 iter in 0.409911 sec = 0.200 msec Seq inner: 2048 iter in 0.173755 sec = 0.085 msec Transfer rates: outside: 102400 kbytes in 0.265611 sec = 385526 kbytes/sec middle: 102400 kbytes in 0.335638 sec = 305091 kbytes/sec inside: 102400 kbytes in 0.324187 sec = 315867 kbytes/sec ======== Ubuntu ======== # wget -O /dev/null http://cachefly.cachefly.net/400mb.test --2015-01-14 14:19:38-- http://cachefly.cachefly.net/400mb.test Resolving cachefly.cachefly.net (cachefly.cachefly.net)... 205.234.175.175 Connecting to cachefly.cachefly.net (cachefly.cachefly.net)|205.234.175.175|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 419430400 (400M) [application/octet-stream] Saving to: ‘/dev/null’ 100%[===================================================================================================================>] 419,430,400 111MB/s in 3.6s 2015-01-14 14:19:42 (111 MB/s) - ‘/dev/null’ saved [419430400/419430400] # time (dd if=/dev/zero of=/tmp/test bs=64k count=16k > /dev/null; sync) 16384+0 records in 16384+0 records out 1073741824 bytes (1.1 GB) copied, 3.53419 s, 304 MB/s real 0m3.618s user 0m0.009s sys 0m3.096s