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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