mismatch results with disk performance
scuba at centroin.com.br
scuba at centroin.com.br
Thu Jun 9 18:31:14 GMT 2005
Hi,
No one else has seem this?
I upgraded to 5.4 and the problem was kept.
Should it be a problem with ICH5 driver?
On Tue, 7 Jun 2005 scuba at centroin.com.br wrote:
|Hi ALL,
|
| I hope it´s not a known issue.
| I´ve installed (express) a FreeBSD 5.3 (I know it´s not the last
|stable) on a new machine with the following hardware:
|
| Asus P4P800 SE (BIOS v. 1008)
| 2GB RAM ( 4x 512 DDR400 )
| 2 HDD Samsung SP0802N (80GB 7200rpm ata-100) 80 pins cable.
|
| The HD were formated with newfs defaults, and the following
|results were the same using both as master (primary e secondary) or with a
|master / slave (same interface).
|
| With diskinfo both performance are the same, but with "dd", the
|second disc (the slave or the secondary master), is always worst as if it
|were working in DMA2.
|
| what should be the right results?
|
| Here are the results:
|
| DD: dd if=/dev/zero of=TEST count=1000 bs=64k
|
| master: 60 Mb/s
| slave: 16 Mb/s
|
| The results with diskinfo (almost the same):
|
|/dev/ad0
| 512 # sectorsize
| 80060424192 # mediasize in bytes (75G)
| 156368016 # mediasize in sectors
| 155127 # Cylinders according to firmware.
| 16 # Heads according to firmware.
| 63 # Sectors according to firmware.
|
|Seek times:
| Full stroke: 250 iter in 5.477568 sec = 21.910 msec
| Half stroke: 250 iter in 4.140590 sec = 16.562 msec
| Quarter stroke: 500 iter in 6.093340 sec = 12.187 msec
| Short forward: 400 iter in 2.088111 sec = 5.220 msec
| Short backward: 400 iter in 2.532713 sec = 6.332 msec
| Seq outer: 2048 iter in 0.261596 sec = 0.128 msec
| Seq inner: 2048 iter in 0.259723 sec = 0.127 msec
|Transfer rates:
| outside: 102400 kbytes in 1.743910 sec = 58719 kbytes/sec
| middle: 102400 kbytes in 2.031982 sec = 50394 kbytes/sec
| inside: 102400 kbytes in 3.354742 sec = 30524 kbytes/sec
|
|=========
|
|/dev/ad1
| 512 # sectorsize
| 80060424192 # mediasize in bytes (75G)
| 156368016 # mediasize in sectors
| 155127 # Cylinders according to firmware.
| 16 # Heads according to firmware.
| 63 # Sectors according to firmware.
|
|Seek times:
| Full stroke: 250 iter in 5.431290 sec = 21.725 msec
| Half stroke: 250 iter in 4.111275 sec = 16.445 msec
| Quarter stroke: 500 iter in 6.282551 sec = 12.565 msec
| Short forward: 400 iter in 1.741538 sec = 4.354 msec
| Short backward: 400 iter in 3.285028 sec = 8.213 msec
| Seq outer: 2048 iter in 0.259503 sec = 0.127 msec
| Seq inner: 2048 iter in 0.258212 sec = 0.126 msec
|Transfer rates:
| outside: 102400 kbytes in 1.720602 sec = 59514 kbytes/sec
| middle: 102400 kbytes in 1.998063 sec = 51250 kbytes/sec
| inside: 102400 kbytes in 3.235904 sec = 31645 kbytes/sec
|
|
|- Marcelo
|
More information about the freebsd-questions
mailing list