UDMA slow with Maxtor Drive

[Troy Sorrells]

I am getting about twice the IDE drive performance in Windows as I
am in Linux.  I have a Maxtor 27GB ATA-66 drive and a DFI
motherboard with the VIA MVP-3 chipset that supports UDMA-33. 
In Windows I run HDTACH and get an average speed of about
23500 kbps.  In Linux running hdparm -t I never top 11 MB/sec.  I
have tried this with the latest versions of Slackware, Red Hat and
Mandrake, all running 2.2 series kernels.  I turn on hdparm
optimizations with 'hdparm -d1c1m16u1 /dev/hda'.  I have tried
changing IDE cables, using the newer 80-pin cable and the
old-style 40-pin  cable.  I don't think the problem is hardware since I
get good scores in Windows.
  
Does anyone have any suggestions?
  
Here is some specifics that may help:
  
  
root:~> hdparm -i /dev/hda
  
/dev/hda:
  
 Model=Maxtor 92732U8, FwRev=RA530JN0, SerialNo=H805XSTC
 Config={ Fixed }
 RawCHS=16383/15/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=17475/15/63, CurSects=16513875, LBA=yes, LBAsects=53177040
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

root:~> hdparm -I /dev/hda
  
/dev/hda:
  
 Model=aMtxro9 72238U                          , FwRev=AR35J00N,
SerialNo=8H50SXCT
 Config={ Fixed }
 RawCHS=16383/15/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=17475/15/63, CurSects=16513875, LBA=yes, LBAsects=53177040
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
  
  
root:~> hdparm -v /dev/hda
  
 /dev/hda:
 multcount    = 16 (on)
 I/O support  =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  1 (on)
 nowerr      =  0 (off)
 readonly    =  0 (off)
 readahead    =  8 (on)
 geometry    = 3310/255/63, sectors = 53177040, start = 0
  
 root:~> hdparm -Tt /dev/hda
  
 /dev/hda:
 Timing buffer-cache reads:  128 MB in  2.25 seconds = 56.89 MB/sec Timing
buffered disk reads:  64 MB in  6.49 seconds =  9.86 MB/sec = 3310/255/63,
sectors =
53177040, start = 0
  
Please CC any responses to me as I am not subscribed to this list.
Thanks!
  
Troy Sorrells