Comment 126 for bug 119730

I'm using jaunty 64 bit.
Unfortunately I've install a mainline kernel
Linux xxx-desktop 2.6.29-02062906-generic #02062906 SMP Fri Jul 3 10:17:03 UTC 2009 x86_64 GNU/Linux
but speed problem persists. Speed transfer between hard disks below 5Mb/sec.

Below hard disks info.

/dev/sda:

 Model=SAMSUNG SP2504C , FwRev=VT100-50, SerialNo=S09QJ1PP321450
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4
 BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=?0?
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=488397168
 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 *udma6
 AdvancedPM=no WriteCache=enabled
 Drive conforms to: unknown: ATA/ATAPI-1,2,3,4,5,6,7

 * signifies the current active mode
--------------------------------------------------------------------------------------------------
/dev/sdb:

 Model=SAMSUNG HD753LJ , FwRev=1AA01113, SerialNo=S13UJDWQ801281
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4
 BuffType=DualPortCache, BuffSize=32767kB, MaxMultSect=16, MultSect=?0?
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=1465149168
 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 *udma6
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: unknown: ATA/ATAPI-3,4,5,6,7

 * signifies the current active mode

Singular Hard disk performance is standard/
sudo hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads: 3872 MB in 2.00 seconds = 1936.29 MB/sec
 Timing buffered disk reads: 194 MB in 3.01 seconds = 64.54 MB/sec

/dev/sdb:
 Timing cached reads: 5664 MB in 2.00 seconds = 2833.85 MB/sec
 Timing buffered disk reads: 286 MB in 3.02 seconds = 94.67 MB/sec