On 03/07/19 10:23:13, Alan Stern wrote: > > [...] > Andrea, another thing you could try is to collect a usbmon trace under > one of the "slow" kernels. Follow the instructions in > Documentation/usb/usbmon.txt. I think you could kill the file-copy > operation after just a couple of seconds; that should provide enough > trace information to help see what causes the slowdown. > > (If you want, do the same test with a "fast" kernel and then we'll > compare the results.) > > Alan Stern > Thanks Alan, so I attach two ouputs, one for a "good" and one for a "bad" kernel. Both killed after roughly 20 seconds, using the command cat /sys/kernel/debug/usb/usbmon/6u > file (my pendrive turns out to be attached to bus #6) Hope it helps. Thanks, Andrea
Attachment:
GOOD_4.20.0-rc1+.mon.out.tar
Description: Unix tar archive
Attachment:
BAD_5.2.0-rc7.mon.out.tar
Description: Unix tar archive
