Tips: Disk Performance On FreeBSD

2009年08月26日 | 分类：Benchmark, FreeBSD | 添加评论 18次浏览

Disk I/O 读写性能:

[9:42am] ~#diskinfo -c /dev/mfid0

/dev/mfid0
512 # sectorsize
598879502336 # mediasize in bytes (558G)
1169686528 # mediasize in sectors
72809 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.

I/O command overhead:
time to read 10MB block 0.747839 sec = 0.037 msec/sector
time to read 20480 sectors 2.280335 sec = 0.111 msec/sector
calculated command overhead = 0.075 msec/sector

Disk 基准性能

[9:43am] ~#diskinfo -t /dev/mfid0

/dev/mfid0
512 # sectorsize
598879502336 # mediasize in bytes (558G)
1169686528 # mediasize in sectors
72809 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.

Seek times:
Full stroke: 250 iter in 1.914729 sec = 7.659 msec
Half stroke: 250 iter in 16.605638 sec = 66.423 msec
Quarter stroke: 500 iter in 16.228270 sec = 32.457 msec
Short forward: 400 iter in 2.160201 sec = 5.401 msec
Short backward: 400 iter in 2.676456 sec = 6.691 msec
Seq outer: 2048 iter in 1.070053 sec = 0.522 msec
Seq inner: 2048 iter in 12.475401 sec = 6.092 msec
Transfer rates:
outside: 102400 kbytes in 1.110726 sec = 92192 kbytes/sec
middle: 102400 kbytes in 0.526613 sec = 194450 kbytes/sec
inside: 102400 kbytes in 1.565801 sec = 65398 kbytes/sec

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