[plug] hdparm troubles

[Steve Boak]

On Sat, 17 Jul 2004 12:24 pm, Craig Foster wrote:
[...]
> What motherboard do you have?

The motherboard is a Via EPAI-V C3 mini-itx with a Via Eden 533MHz processor, 
VIA8601A northbridge and VT8231 Southbridge chipsets.
Debian testing, and custom Kernel 2.4.22 if that matters, relevant kernel 
options:

# IDE chipset support/bugfixes (unset options removed)
#
CONFIG_BLK_DEV_CMD640=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_SHARE_IRQ=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_BLK_DEV_PIIX=y
CONFIG_BLK_DEV_RZ1000=y
CONFIG_BLK_DEV_VIA82CXXX=y
CONFIG_IDEDMA_AUTO=y
CONFIG_BLK_DEV_IDE_MODES=y

I agree with Bernd in a separate reply:
>Seems like DMA isn't actually on. I get 5.64 MB/sec on my 933MHz C3

I tested with dma off (hdparm -X68 -c1 -m16 -d0 /dev/hda), and the disk 
transfer rate *almost doubled* from 3.69MB/sec to 6.64MB/sec! 
So there is definitely something wrong with DMA, either the driver or the 
hardware. I'm off to google some more...

Out of interest, here's the proc info on the ide interface:

min:~# cat /proc/ide/via
----------VIA BusMastering IDE Configuration----------------
Driver Version:                     3.37
South Bridge:                       VIA vt8231
Revision:                           ISA 0x10 IDE 0x6
Highest DMA rate:                   UDMA100
BM-DMA base:                        0xd000
PCI clock:                          33.3MHz
Master Read  Cycle IRDY:            0ws
Master Write Cycle IRDY:            0ws
BM IDE Status Register Read Retry:  yes
Max DRDY Pulse Width:               No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush:          yes                 yes
End Sector FIFO flush:         no                  no
Prefetch Buffer:              yes                 yes
Post Write Buffer:            yes                 yes
Enabled:                      yes                  no
Simplex only:                  no                  no
Cable Type:                   80w                 40w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode:       UDMA       PIO       PIO       PIO
Address Setup:       30ns     120ns     120ns     120ns
Cmd Active:          90ns      90ns     480ns     480ns
Cmd Recovery:        30ns      30ns     480ns     480ns
Data Active:         90ns     330ns     330ns     330ns
Data Recovery:       30ns     270ns     270ns     270ns
Cycle Time:          30ns     600ns     600ns     600ns
Transfer Rate:   66.6MB/s   3.3MB/s   3.3MB/s   3.3MB/s

Any more information that would help?

Steve

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