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Recently I did hdparm on my Ultra5 box with one standard hdd on-board
(hde), one ATA66 hdd pluged on an IDE expansion card (hde). Result given
below.
One question: why all of my other boxes (all my boxes using default
value for hdds) shows "buffered cached read" speed, but this box
"O_DIRECT cached read"?
I googled around and tracked some mailing list arguements, it seems
O_DIRECT is just another mode than "buffered", which is very close in
performance (said so by a hacker on year 2001), and I could just keep it
as is. But I just put this question on the list in case I am wrong and
could get knowledge from experts ^_^
sappho zhangweiwu # hdparm -tT /dev/hde /dev/hda
/dev/hde:
Timing O_DIRECT cached reads: 576 MB in 2.00 seconds = 288.00 MB/sec
Timing O_DIRECT disk reads: 66 MB in 3.04 seconds = 21.71 MB/sec
/dev/hda:
Timing O_DIRECT cached reads: 576 MB in 2.00 seconds = 288.00 MB/sec
Timing O_DIRECT disk reads: 20 MB in 3.30 seconds = 6.06 MB/sec
--
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