dma problems with 2.6 kernel and vt8233A southbridge

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Date: Tue, 23 Aug 2005 02:24:51 GMT

I have a problem activating dma on my vt8233A southbridge.
I have 2 identical disks, the second controller works fine -- dma
automatically. I cannot get any dma through my southbridge though.
I have identical disks on the vt8233A controller (hdb) and a HPT372
controller (hdg). The HighPoint controller works fine with the drive,
Maxtor 60G, ATA100.
In the kernel, I've compiled support for the HighPoint chipset in the
kernel, BLK_DEV_HPT366. I've also set automatic use of DMA for IDE
drives, IDEDMA_PCI_AUTO. I don't see any special compile options in
regards to the VT8233A chipset.
On the net, there was some discussion about early 2.4 kernels not
supporting this chipset, but as of 2.4.19, it had been fixed. I've
recently upgraded from my old 2.4.xx to 2.6.11 and now to 2.6.12-6 and
have noticed this performance problem since then.

Here is a sample of some commands I've used to gather information and
correct the problem:
# hdparm -i /dev/hd[abeg]
/dev/hda:
  Model=WDC WD1600JB-00FUA0, FwRev=15.05R15, SerialNo=WD-WMAEP1214820
  Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
  RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=74
  BuffType=DualPortCache, BuffSize=8192kB, MaxMultSect=16, MultSect=16
  CurCHS=65535/1/63, CurSects=4128705, 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: device does not report version:
  * signifies the current active mode

/dev/hdb:
  Model=Maxtor 96147H6, FwRev=ZAH814Y0, SerialNo=V603P98C
  Config={ Fixed }
  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
  BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
  CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=120064896
  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: disabled (255) WriteCache=enabled
  Drive conforms to: ATA/ATAPI-6 T13 1410D revision 0:
  * signifies the current active mode

/dev/hde:
  Model=WDC WD1200BB-60CJA0, FwRev=16.06V16, SerialNo=WD-WMAA91061045
  Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
  RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
  BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=234441648
  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: device does not report version:
  * signifies the current active mode

/dev/hdg:
  Model=Maxtor 96147H6, FwRev=ZAH814Y0, SerialNo=V60C42GC
  Config={ Fixed }
  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
  BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=120064896
  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: disabled (255) WriteCache=enabled
  Drive conforms to: ATA/ATAPI-6 T13 1410D revision 0:
  * signifies the current active mode

# hdparm -d1 /dev/hd[abeg]
/dev/hda:
  setting using_dma to 1 (on)
  HDIO_SET_DMA failed: Operation not permitted
  using_dma = 0 (off)
/dev/hdb:
  setting using_dma to 1 (on)
  HDIO_SET_DMA failed: Operation not permitted
  using_dma = 0 (off)
/dev/hde:
  setting using_dma to 1 (on)
  using_dma = 1 (on)
/dev/hdg:
  setting using_dma to 1 (on)
  using_dma = 1 (on)

# hdparm -tT /dev/hd[abeg]
/dev/hda:
  Timing cached reads: 924 MB in 2.00 seconds = 461.15 MB/sec
  Timing buffered disk reads: 12 MB in 3.27 seconds = 3.67 MB/sec
/dev/hdb:
  Timing cached reads: 1012 MB in 2.01 seconds = 504.06 MB/sec
  Timing buffered disk reads: 10 MB in 3.22 seconds = 3.11 MB/sec
/dev/hde:
  Timing cached reads: 924 MB in 2.01 seconds = 460.69 MB/sec
  Timing buffered disk reads: 134 MB in 3.02 seconds = 44.33 MB/sec
/dev/hdg:
  Timing cached reads: 980 MB in 2.00 seconds = 488.85 MB/sec
  Timing buffered disk reads: 74 MB in 3.00 seconds = 24.65 MB/sec

I'm running RHF4 (+extras and updates) 2.46.12-on a ABit KX7-333R
motherboard, with 1GB RAM, and the following drives Western Digital
WD1600JB-00FUA0 160GB ATA100 (hda), 2 Maxtor 96147H6 60GB ATA100's (hdb,
hdg), and Western Digital WD1200BB-60CJA0 120GB ATA100 (hde).

Please help.

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