Re: ahci performance problem? (much slower than sil24)

["kyle" <kylewong@southa.com>]

Sorry again, please cc me if possible as I'm not subscribed. Thanks

----- Original Message ----- 
From: "kyle" <kylewong@southa.com>
To: <linux-ide@vger.kernel.org>
Sent: Wednesday, April 23, 2008 9:37 AM
Subject: ahci performance problem? (much slower than sil24)


> Sorry ... pressed the wrong key and sent the unfinished email ...
>
> Hi,
> I've built a new machine with Intel Desktop Board DQ35JO, Intel E2160 CPU,
> and 8 x Seagate ST3500320AS 500MB SATA harddisks. 6 of the 8 harddisks are
> connected to the motherboard's SATA ports, while the remaining 2 are
> connected to a 2 ports PCI-E card with sil24.
>
> kernel is 2.6.24.5, have tried fedora kernel 2.6.23.1-42 and 2.6.24.4-64,
> all give the same result.
>
> sda,b,c .... to sdf are running ahci driver, sdg and sdh are running sil24
> driver
>
> hdparm -t /dev/sd{a-f} give around 45-46MB/sec
> [root@localhost log]# hdparm -t /dev/sda
> /dev/sda:
> Timing buffered disk reads:  140 MB in  3.02 seconds =  46.42 MB/sec
>
> hdparm -t /dev/sdg and sdh give over 105MB/sec
> [root@localhost log]# hdparm -t /dev/sdg
> /dev/sdg:
> Timing buffered disk reads:  316 MB in  3.01 seconds = 105.13 MB/sec
>
> had updated to latest BIOS, no change in hdparm test b4/after update.
> hdparm -i:
>
> [root@localhost boot]# hdparm -i /dev/sda
> /dev/sda:
> Model=ST3500320AS                             , FwRev=SD15    , SerialNo=
>      9QM2Q7F4
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=?16?
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
> 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=no WriteCache=enabled
> Drive conforms to: unknown:  ATA/ATAPI-4,5,6,7
> * signifies the current active mode
>
> [root@localhost boot]# hdparm -i /dev/sdb
>
> /dev/sdb:
>
> Model=ST3500320AS                             , FwRev=SD15    , SerialNo=
>      9QM2H18H
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=?16?
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
> 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=no WriteCache=enabled
> Drive conforms to: unknown:  ATA/ATAPI-4,5,6,7
>
> * signifies the current active mode
>
> ...........................
>
> [root@localhost boot]# hdparm -i /dev/sdg
>
> /dev/sdg:
>
> Model=ST3500320AS                             , FwRev=SD15    , SerialNo=
>      9QM2LE0C
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=?16?
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=268435455
> 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=no WriteCache=enabled
> Drive conforms to: unknown:  ATA/ATAPI-4,5,6,7
>
> * signifies the current active mode
>
> attached dmesg
>
> Please help, thank you very much
>
> Regards,
> Kyle
>
>
>
>