Jürgen Keil wrote:
>> But Juergen is correct of course, try to see first what your interface
>> gives you when reading / writing "raw". That's the benchmark, you can't
>> expect pcfs to beat these numbers - and if they're too low, the first
>> thing to address is why the device doesn't do USB 2 (though it should ?).
>>
>
> According to Bruno' reply...
>
> http://www.opensolaris.org/jive/thread.jspa?messageID=223135#222849
>
> ... the usb storage device is connect to an usb 2.0 hub, and does seem
> to use usb 2.0 protocol.
>
> The box has 4GB of physical ram, so a part of it should be remapped to
> physical addresses >= 4GB, and (AFAIR) the ehci driver does not yet
> support DMA to addresses >= 4GB. So ehci might be blocked waiting for
> DMA resources / memory below 4GB...
>
>
>
>> FrankH.
>>
>>
>>> Bruno: is both reading from and writing to the USB
>>>
>> drive slow?
>>
>>> How much physical memory do you have installed in
>>>
>> the machine?
>>
>>> Try to read 100mbytes directly from the raw usb
>>>
>> storage device,
>>
>>> using different block sizes; how long does it
>>>
>> take?
>>
>>> # ptime dd if=/dev/rdsk/c6t0d0p0 of=/dev/null bs=8k
>>>
>> count=12800
>>
>>> 12800+0 records in
>>> 12800+0 records out
>>>
>>> real 14.449
>>> user 0.039
>>> sys 0.345
>>>
>>>
>>> # ptime dd if=/dev/rdsk/c6t0d0p0 of=/dev/null
>>>
>> bs=32k count=3200
>>
>>> 3200+0 records in
>>> 3200+0 records out
>>>
>>> real 11.531
>>> user 0.010
>>> sys 0.141
>>>
>>>
>>> # ptime dd if=/dev/rdsk/c6t0d0p0 of=/dev/null
>>>
>> bs=256k count=400
>>
>>> 400+0 records in
>>> 400+0 records out
>>>
>>> real 10.706
>>> user 0.002
>>> sys 0.085
>>>
>>>
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>>>
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>> for the value of this heavenly gift far exceeds that
>> of any fortune on earth.
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>
>
> This message posted from opensolaris.org
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>
Thank you all for your feedback, I had no time yesterday to carry on
investigations, I will make some more extensive tests asap (ie
read:write/ test my laptop that has only 2MB ram /test in 32bit
kernel/test with ufs/zfs/ntfs)
Bruno
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