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SubjectRe: Yet another disk transfer speed problem
Date
Have you considered that perhaps one of your drives is just faster than the
other?
This happens.

-joe

----- Original Message -----
From: "Bharath Krishnan" <bharath@mit.edu>
To: <linux-kernel@vger.kernel.org>
Sent: Thursday, February 28, 2002 11:34 AM
Subject: Yet another disk transfer speed problem


> Hello!
>
> Please CC: me on replies,
>
> Problem: ata disk on secondary controller of PDC20265
> gives sub-par performance.
>
> both disks have c3 and d1 set along with X69.
>
> hdparm -tT /dev/hdg:
> /dev/hdg:
> Timing buffer-cache reads: 128 MB in 0.77 seconds =166.23 MB/sec
> Timing buffered disk reads: 64 MB in 3.81 seconds = 16.80 MB/sec
>
> compared to
> hdparm -tT /dev/hde:
> /dev/hde:
> Timing buffer-cache reads: 128 MB in 0.73 seconds =175.34 MB/sec
> Timing buffered disk reads: 64 MB in 1.82 seconds = 35.16 MB/sec
>
>
> Setup:
> kernel: 2.4.17
> pdc20265 controller on asus a7v motherboard.
> kernel config options:
> CONFIG_BLK_DEV_PDC202XX=y
> CONFIG_PDC202XX_BURST=y
> # CONFIG_PDC202XX_FORCE is not set
> # CONFIG_BLK_DEV_ATARAID_PDC is not set
>
> similar behavior with redhat 7.2 updated kernel 2.4.9-21
>
> hde: IBM-DTLA-307015, ATA DISK drive
> hdg: MAXTOR 6L040J2, ATA DISK drive
>
> Interesting stuff from dmesg:
> ide2: BM-DMA at 0x8000-0x8007, BIOS settings: hde:DMA, hdf:pio
> ide3: BM-DMA at 0x8008-0x800f, BIOS settings: hdg:DMA, hdh:pio
>
> cat /proc/ide/ide2/config
> pci bus 00 device 88 vid 105a did 0d30 channel 0
> 5a 10 30 0d 07 00 10 02 02 00 80 01 00 20 00 00
> 01 94 00 00 01 90 00 00 01 88 00 00 01 84 00 00
> 01 80 00 00 00 00 00 d4 00 00 00 00 5a 10 33 4d
> 00 00 00 00 58 00 00 00 00 00 00 00 0a 01 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> be 33 00 00 00 00 00 00 01 00 01 00 00 00 00 00
> f1 24 41 00 c4 f3 4f 00 f1 24 41 00 c4 f3 4f 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> cat /proc/ide/ide3/config
> pci bus 00 device 88 vid 105a did 0d30 channel 1
> 5a 10 30 0d 07 00 10 02 02 00 80 01 00 20 00 00
> 01 94 00 00 01 90 00 00 01 88 00 00 01 84 00 00
> 01 80 00 00 00 00 00 d4 00 00 00 00 5a 10 33 4d
> 00 00 00 00 58 00 00 00 00 00 00 00 0a 01 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> be 33 00 00 00 00 00 00 01 00 01 00 00 00 00 00
> f1 24 41 00 c4 f3 4f 00 f1 24 41 00 c4 f3 4f 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> hdparm -i
> /dev/hde
> Model=IBM-DTLA-307015, FwRev=TX2OA50C, SerialNo=YF0YFFX4393
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=40
> BuffType=DualPortCache, BuffSize=1916kB, MaxMultSect=16, MultSect=16
> CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=30003120
> 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 udma0 udma1 udma2 udma3 udma4 *udma5
> AdvancedPM=yes: disabled (255)
> Drive Supports : ATA/ATAPI-5 T13 1321D revision 1 : ATA-2 ATA-3 ATA-4
> ATA-5
>
> /dev/hdg
> Model=MAXTOR 6L040J2, FwRev=A93.0300, SerialNo=662125114610
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> RawCHS=16383/16/63, TrkSize=32256, SectSize=21298, ECCbytes=4
> BuffType=DualPortCache, BuffSize=1820kB, MaxMultSect=16, MultSect=16
> CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=78177792
> 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 udma0 udma1 udma2 udma3 udma4 *udma5 udma6
> AdvancedPM=no
> Drive Supports : ATA/ATAPI-5 T13 1321D revision 1 : ATA-1 ATA-2 ATA-3
> ATA-4 ATA-5
>
> cat /proc/ide/pdc202xx
> PDC20265 Chipset.
> ------------------------------- General Status
> ---------------------------------Burst Mode :
> enabled
> Host Mode : Normal
> Bus Clocking : 33 PCI Internal
> IO pad select : 10 mA
> Status Polling Period : 8
> Interrupt Check Status Polling Delay : 11
> --------------- Primary Channel ---------------- Secondary Channel ----
> enabled enabled
> 66 Clocking enabled enabled
> Mode PCI Mode PCI
> FIFO Empty FIFO Empty
> --------------- drive0 --------- drive1 -------- drive0 ----------
> drive1 -DMA enabled: yes no
> yes no
> DMA Mode: UDMA 4 NOTSET UDMA 4
> NOTSET
> PIO Mode: PIO 4 NOTSET PIO 4
> NOTSET
>
>
> What is going on? I do have ata100 cables.
>
> Thanks,
>
> -bharath
> -
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