配置：E5400+P41（ICH10）+希捷11代500G sata
一、AHCI：
diskinfo -ctv /dev/ada0
/dev/ada0
512 # sectorsize
500107862016 # mediasize in bytes (466G)
976773168 # mediasize in sectors
0 # stripesize
0 # stripeoffset
969021 # Cylinders according to firmware.
16 # Heads according to firmware.
63 # Sectors according to firmware.
5VM2ZAL3 # Disk ident.
I/O command overhead:
time to read 10MB block 0.101410 sec = 0.005 msec/sector
time to read 20480 sectors 2.590316 sec = 0.126 msec/sector
calculated command overhead = 0.122 msec/sector
Seek times:
Full stroke: 250 iter in 5.842587 sec = 23.370 msec
Half stroke: 250 iter in 4.153859 sec = 16.615 msec
Quarter stroke: 500 iter in 6.733396 sec = 13.467 msec
Short forward: 400 iter in 1.862230 sec = 4.656 msec
Short backward: 400 iter in 1.671682 sec = 4.179 msec
Seq outer: 2048 iter in 0.114694 sec = 0.056 msec
Seq inner: 2048 iter in 0.267015 sec = 0.130 msec
Transfer rates:
outside: 102400 kbytes in 0.756072 sec = 135437 kbytes/sec
middle: 102400 kbytes in 0.925528 sec = 110640 kbytes/sec
inside: 102400 kbytes in 1.470385 sec = 69642 kbytes/sec
二、ata
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