I have two PATA based systems which now have woeful disk throughput
following the feisty upgrade and aren't able to re-enable DMA on either
system (e.g. less than 5MB/sec). One is a Via based MSI K7T266 Pro 2-A
(6380), the other is an Intel based ASUS CUSL2-C. The Via system used
to enjoy 60+MB/sec prior to the upgrade. After the upgrade neither IDE
drive was remapped to the new sdx format and are still accessible as
/dev/hda and /dev/hdb. Not sure if this relates to lilo or because I use
XFS as my root filesystem (yes I now realize this is not the best
option) It is interesting to note that hdparm displays duplicates UDMA
modes and wonder if this has something to do with it or if its simply a
display bug (e.g. UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma3
udma4 *udma5 )
Attachment with full output from uname, hdparm, dmesg, lspci -v, and
lsmod attached.
uname -a
========
Linux jupiter2.home.net 2.6.20-15-server #2 SMP Sun Apr 15 07:41:34 UTC 2007
i686 GNU/Linux
hdparm -i /dev/hda
==================
/dev/hda:
Model=ST3320620A, FwRev=3.AAD, SerialNo=9QF01P05
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=16384kB, MaxMultSect=16, MultSect=16
CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=268435455
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
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma3 udma4 *udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: Unspecified: ATA/ATAPI-1 ATA/ATAPI-2 ATA/ATAPI-3
ATA/ATAPI-4 ATA/ATAPI-5 ATA/ATAPI-6 ATA/ATAPI-7
* signifies the current active mode
hdparm /dev/hda
===============
/dev/hda:
multcount = 16 (on)
IO_support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 0 (off)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
geometry = 38913/255/63, sectors = 625142448, start = 0
hdparm -d1 /dev/hda
===================
/dev/hda:
setting using_dma to 1 (on)
using_dma = 0 (off)
HDIO_SET_DMA failed: Operation not permitted
hdparm -tT /dev/hda
===================
/dev/hda:
Timing cached reads: 596 MB in 2.00 seconds = 297.85 MB/sec
Timing buffered disk reads: 16 MB in 3.15 seconds = 5.09 MB/sec
** Attachment added: "Same here - Massive PATA slowdown"
http://librarian.launchpad.net/7676736/MSI%20K7T266%20Pro%202-A%20%286380%29.txt
--
hdparm - cannot set dma on IDE hard drive that works via pata
https://bugs.launchpad.net/bugs/110636
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