Hi Alan!
On Mit, 24 Mai 2006, Alan Stern wrote:
> The normal usb-storage debugging isn't very good for tracking down
> intermittent problems like this. However if you want, you can add your
> own printk statements to the driver to find out exactly when each reset
> starts and ends.
Ok, I retract my statement that the reset takes so long, it takes less
than a second. I have put a printk before and another after the two
resets ( port reset and transport reset). I could only see port resets
and they usually take less than one second. Transport resets didn't
occur at all, ie. result = usb_stor_port_reset(us) always was > 0.
So it seems that my ls tests are not very useful. Interestingly I
observed the following: ls hangs always till there is a port reset, than
it succeeds. It looks like this: I do permanent ls -l of the target
direcory and can see the files growing with every ls -l. Then suddenly
nothing changes, and a ls -l onto other file hangs.
Then the port reset and the other ls continues, and the ls -l shows the
files again growing.
Maybe it is only that the hard disk needs so much time to actually safe
the data and while this time it is blocking. Possible?
I did another time run, for copying the same 30 files, each around
230Mb to the devidce, and this time I had again 29 resets and
real 25m28.033s
user 0m0.272s
sys 0m29.250s
I found something strange than, maybe only strange for me:
9727 ? D 0:00 [pdflush]
9733 ? D 0:00 [pdflush]
9735 ? D 0:00 [pdflush]
9736 ? D 0:00 [pdflush]
9738 ? D 0:00 [pdflush]
9749 ? D 0:00 [pdflush]
9785 ? D 0:00 [pdflush]
9788 ? D 0:00 [pdflush]
9789 ? D 0:00 [pdflush]
9790 ? D 0:00 [pdflush]
Hmmm... so many of them? But I have no idea about these kernel layers.
They go away when the copying is finished.
Best wishes
Norbert
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Dr. Norbert Preining <preining AT logic DOT at> Università di Siena
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