Re: Unreliable USB3 with NEC uPD720200 and Delock Cardreader

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Am 25.10.2012 03:24, schrieb Ming Lei:
Lei, do you have any doc describing how to use those tracepoints?

Hi Bjorn Helgaas,

Firstly, please enable these tracepoints via below

           echo 1 > /sys/kernel/debug/tracing/events/rpm/enable

then store the trace event result by below once you make sure your interested
events are completed:

           echo 0 > /sys/kernel/debug/tracing/events/rpm/enable
           cp /sys/kernel/debug/tracing/trace /media/ram/rpm-trace

Hi,

I have created a trace according this description. Therefore I have rebooted my system, enabled the trace and inserted and removed the SD-card until the controller stops working. During this procedure I observed that the controller seems to be more stable. I had to insert and remove the SD-card several times until the controller stopped working. Normally the controller will fail on the first attempt. Also I had the impression (not sure about this since I have not measured it) that the card reader reads the data faster.

I append the gzipped trace and the corresponding dmesg output.

Best Regards
Uli
--
Ulrich Eckhardt                  http://www.uli-eckhardt.de

Ein Blitzableiter auf dem Kirchturm ist das denkbar stärkste
Misstrauensvotum gegen den lieben Gott. (Karl Krauss)

Attachment: trace.txt.gz
Description: application/gunzip

Attachment: dmesg.txt.gz
Description: application/gunzip


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