Same problem. Some data:
:~$ cat /etc/issue
Ubuntu 8.04.1 \n \l
:~$ uname -a
Linux netstar 2.6.24-19-generic #1 SMP Wed Jun 18 14:15:37 UTC 2008 x86_64
GNU/Linux
:~$ sudo hdparm -i /dev/sda
/dev/sda:
Model=ST9160821AS , FwRev=3.BHE ,
SerialNo=5MA5P0FB
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=8192kB, MaxMultSect=16, MultSect=?16?
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=312581808
IORDY=on/off, tPIO={min:120,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=yes: unknown setting WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6,7
* signifies the current active mode
:~$ sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 1192 MB in 2.00 seconds = 595.79 MB/sec
Timing buffered disk reads: 128 MB in 3.04 seconds = 42.13 MB/sec
--
Slow SATA performance
https://bugs.launchpad.net/bugs/119730
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