On Thu, 5 Jun 2003, Major A wrote:

> OK, here we go. The drive is now connected directly to the EHCI host,
> and it does the exact same thing (hang) after I type "md5sum *.png >
> md5sums", _except_ that the system load stays down (much less than 1),
> which means the computer doesn't spend most its time waiting for I/O,
> and that there is no timeout or oops in the logs. What you see below
> is all, I've waited for quite a while now (10 minutes) and it just
> doesn't give more output.

Interesting.  This log shows no errors at all.  It's got a couple of reads
followed by 12 writes, and they all completed successfully.  Judging from
this, I would say that the problem must lie somewhere else, not in the USB
driver.

I don't understand why the same test should behave differently depending 
on whether the device is attached directly to the host or not.  If you 
also have a non-EHCI host in your system, it might be worth trying the 
same tests using that controller.

Maybe another possibility is a flaw in the filesystem code (I'm guessing 
wildly here).  Is it possible to use a different sort of filesystem and 
repeat the tests?  And related to that, did your original command ever 
end up writing anything to the md5sums output file?

Alan Stern



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