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Performance problem with CF card on AMD CS5536 IDE

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From: Stefan Klein <klein@...>
To: <misc@...>
Subject: Performance problem with CF card on AMD CS5536 IDE
Date: Monday, October 22, 2007 - 10:28 am

Hi list,


I have got an interesting problem here. When I use a CF card on Geode LX-800

board, the performance is extremely low (about 1MB/s for reading). I suppose

it is not a hardware problem: Under windows, the performance of read/writes on

the CF is fine.


This is what I get in dmesg:


pciide0 at pci0 dev 15 function 2 "AMD CS5536 IDE" rev 0x01: DMA, channel 0

wired to compatibility, channel 1 wired to compatibility


wd0 at pciide0 channel 0 drive 0:

wd0: 1-sector PIO, LBA, 1983MB, 4062240 sectors

wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2

pciide0: channel 1 ignored (disabled)


(Using a more or less standard 4.1 - kernel)


so I guess the kernel is recognizing the controller OK.

If I use a "standard" harddisk under OpenBSD, the performance is fine, too.

(I do not have the according dmesg for this, but I can get one if that helps)


The same behaviour occurs with other boards (for example  the new ALIX board

from pcengines).


Any ideas?
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Messages in current thread:
Performance problem with CF card on AMD CS5536 IDE, Stefan Klein, (Mon Oct 22, 10:28 am)
Re: Performance problem with CF card on AMD CS5536 IDE, Brian A. Seklecki, (Mon Oct 22, 11:12 am)
Re: Performance problem with CF card on AMD CS5536 IDE, Stefan Klein, (Wed Oct 24, 5:26 am)
Re: Performance problem with CF card on AMD CS5536 IDE, Chris Kuethe, (Mon Oct 22, 12:13 pm)
Re: Performance problem with CF card on AMD CS5536 IDE, Jan Stary, (Mon Oct 22, 10:49 am)