UDMA3(ATA33)
# hdparm -X66 -c1 -d1 -m16 /dev/hda
UDMA4(ATA66)
# hdparm -X68 -c1 -d1 -m16 /dev/hda
UDMA5(ATA100)
# hdparm -X69 -c1 -d1 -m16 /dev/hda
hdparm -tT /dev/hda 測硬碟速度
實際經驗:
shell# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 264 MB in 2.01 seconds = 131.30 MB/sec
Timing buffered disk reads: 52 MB in 3.06 seconds = 16.98 MB/sec
shell# hdparm -d 1 /dev/hda
/dev/hda:
setting using_dma to 1 (on)
using_dma = 1 (on)
shell# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 412 MB in 2.02 seconds = 204.40 MB/sec
Timing buffered disk reads: 52 MB in 3.01 seconds = 17.29 MB/sec
s31:/mnt/gentoo# hdparm -d 1 -A 1 -m 16 -u 1 -a 64 /dev/hda
/dev/hda:
setting fs readahead to 64
setting multcount to 16
setting unmaskirq to 1 (on)
setting using_dma to 1 (on)
setting drive read-lookahead to 1 (on)
multcount = 16 (on)
unmaskirq = 1 (on)
using_dma = 1 (on)
readahead = 64 (on)
shell# hdparm -tT /dev/hda
/dev/hda:
Timing cached reads: 468 MB in 2.01 seconds = 233.22 MB/sec
Timing buffered disk reads: 52 MB in 3.09 seconds = 16.82 MB/sec
