USB 2.0 harddisk performance

[Dany Nativel]

add a line to your kernel config file with :
device ehci 
or options ehci... I'm not sure. Check your kernel config file, it 
should be the same as ohci! ... sorry I'm not in front of my fbsd box.

Also don't forget to enable DMA for your drives.
you can switch DMA (it should be on for HD) for CDROM/CDRW through 
/boot/loader.conf

#sysctl -a | gep dma
to see HDD status
#sysctl -a | grep atapi    
to see CD status



Guy Van Sanden wrote:

>Silly question Dany, how do I enable EHCI?
>
>
>
>On Mon, 2004-03-01 at 17:11, Dany Nativel wrote:
>  
>
>>Have you enabled EHCI support ?
>>
>>Even with EHCI enabled the speed won't be that great. According to the 
>>man page, the code is still under development and therefore pretty buggy.
>>
>>Maybe you'll have better luck with Firewire.
>>
>>Dany
>>
>>Guy Van Sanden wrote:
>>
>>    
>>
>>>I have a USB 2.0 harddisk (internally ATA-100) connected to a USB 2.0
>>>port.
>>>
>>>Unfortunatly, data transfers are limited to 1 MB/second (reported by
>>>FreeBSD on detection, and confirmed using Bonnie).
>>>
>>>Any ideas?
>>>
>>>I'm running 5.2.1
>>>
>>> 
>>>
>>>      
>>>
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>>