Asus K8N-E and slow disk transfer

Ganael Laplanche ganael.laplanche at
Wed Jan 5 09:43:13 PST 2005

Hi all,

I've just bought an ASUS K8N-E mobo. I'm using FreeBSD-5.3-Stable (amd64) and
suffering from *very* slow disk transfer rates. The chipset is an nforce3 and is
correctly detected at boot :

# dmesg
atapci0: <nVidia nForce3 Pro UDMA133 controller> port
0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 8.0 on pci 0

My disk is an UDMA100 one, everything seems to be correct :
# atacontrol mode 0
Master = UDMA100
Slave  = BIOSPIO

# sysctl -a
hw.ata.atapi_dma: 1
hw.ata.ata_dma: 1

But the whole system is very very slow. Copying a 600 MB takes about 10 minutes
(1 MB/sec) and make the system nearly unusable during the copy.

Do you have any idea ?

ganael.laplanche at
Tel : (+33)

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