Hi all,
We met a USB performance problem on a custom 8347
board with 2.4.31. When copying small files no
more than 100MB in size, it worked smoothly with
NEC or VIA PCI card. But copying a big file like
more than 150MB in size would decrease the
copying
speed a lot. Serial console even couldn't
response
'ls' command. The target has a 128MB DDR RAM.
While the same driver with 2.4.31 worked fine on
a
8248 custom board. What could the problem be?
Sorry to distrub you during Christmas Time.
Thanks in advance,
Sam
Best regards,
Sam
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Sam Song [off-list ref] wrote:
Hi all,
We met a USB performance problem on a custom
8347board with 2.4.31. When copying small
files no more than 100MB in size, it worked
smoothly with NEC or VIA PCI card. But
copying a big file like more than 150MB
in size would decrease the copying
speed a lot. Serial console even couldn't
response 'ls' command. The target has a
128MB DDR RAM.
Ummm, actually, 256MB DDR RAM.
While the same driver with 2.4.31 worked fine
on a 8248 custom board. What could the
problem be?
Arhhhh, it was due to USB 1.1 limitation
itself(8347 USB 2.0 driver wasn't added
yet when I posted it). Only on the
workable 8248 target with USB 1.1 driver,
it would have such a phenomena. There was
even a network error displayed. If working
with USB 2.0, no any problem. New to me:-)
But Well, I don't have the guts
to say this is a kernel's bug:-)
Sorry to distrub you during Christmas Time.
OK, stay on relax, pls.
Best regards,
Sam
__________________________________________________
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