problems with ide dma

holluby@mail.matav.hu ("holluby@mail.matav.hu")
Sun, 8 Sep 1996 11:30:46 +0000 (GMT)


Hi !

I tried many kernels of the 2.0.xx series, and ide dma does not work.
I tried 2.0, 2.0.7, 2.0.9, 2.0.14, 2.0.17
The only eception is 2.0.9, where dma seems to work fine, but
tests with this kernel show strange interesting results.

With some kernels I cannot get to the login promt at all, some seems
to work for a while, but heawy compile always stops with signal 11,
internal error or something like that. If I turn dma off (or boot them
with ide0=noautotune) they work well.

I have an ASUS P/I P55T2P4 P100 (Triton II chipset) motherboard with
16 Meg EDO RAM and Quantum fireball 1280A ide hard disk.
I tried to slow down the machine in setup, but it didnot help.

I compile everythin possible in modules (even the floppy, slip and serial
drivers) only elf, aout, ext2fs, ipc, tcpip, ide and triton is compiled in.

***************** test with Kernel 2.0.9:
dma works fine with this one. According to hdparm3.1 disk transfer
is much faster when dma on, but kernel copiles faster if dma is off.

$make clean
$hdparm -d0
$hdparm -t
/dev/hda:
Timing buffered disk reads: 16 MB in 3.22 seconds = 4.97 MB/sec

$time make zImage
400.85user 27.51system 7:20.76elapsed 97%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

$make clean
$hdparm -d1
$hdparm -t
/dev/hda:
Timing buffered disk reads: 16 MB in 2.65 seconds = 6.04 MB/sec

$make zImage
399.65user 27.69system 7:24.45elapsed 96%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

$cat /proc/pci
PCI devices found:
Bus 0, device 12, function 0:
VGA compatible controller: S3 Inc. Trio32/Trio64 (rev 64).
Medium devsel. IRQ 11.
Non-prefetchable 32 bit memory at 0xf4000000.
Bus 0, device 7, function 1:
IDE interface: Intel 82371SB Natoma/Triton II PIIX (rev 0).
Medium devsel. Fast back-to-back capable. Master Capable. Latency=32
I/O at 0xe800.
Bus 0, device 7, function 0:
ISA bridge: Intel 82371SB Natoma/Triton II PIIX (rev 1).
Medium devsel. Fast back-to-back capable. Master Capable. No bursts.
Bus 0, device 0, function 0:
Host bridge: Intel 82439HX Triton II (rev 1).
Medium devsel. Master Capable. Latency=32.

*************

If enyone have some idea please mail me. I am not on this list.

Holluby Istvan Budapest
(holluby@mail.matav.hu)