Hi all,
I just did a clean install just couple of days ago. Now on Intrepid but the
issue persists, infacts this has become insane.
Default timings
sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 426 MB in 2.00 seconds = 212.75 MB/sec
Timing buffered disk reads: 86 MB in 3.04 seconds = 28.26 MB/sec
Setting the hdd's for best performance
sudo hdparm -a1 -A1 -d1 /dev/sda
/dev/sda:
setting fs readahead to 1
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Inappropriate ioctl for device
setting drive read-lookahead to 1 (on)
HDIO_GET_DMA failed: Inappropriate ioctl for device
readahead = 0 (off)
look-ahead = 1 (on)
Again doing the test
sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 398 MB in 2.00 seconds = 198.59 MB/sec
Timing buffered disk reads: 30 MB in 3.13 seconds = 9.58 MB/sec
It has actually has come down :(
This is on kernel 2.6.27-7-generic
Just for info. here are the hard disk details again :-
sudo hdparm -i /dev/sda
/dev/sda:
Model=SAMSUNG SP0802N , FwRev=TK100-24,
SerialNo=S00JJ10X390473
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4
BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=?16?
CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=156368016
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-7 T13 1532D revision 0: ATA/ATAPI-1,2,3,4,5,6,7
* signifies the current active mode
--
poor performance hard disk IDE
https://bugs.launchpad.net/bugs/96693
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