Le 13/05/2016 18:45, Rick Stevens a écrit : > On 05/13/2016 02:12 AM, François Patte wrote: >> Bonjour, >> >> The issue now is about wifi connections and usb (!!) >> >> If I plug an external usb harddrive, the wifi connection becomes awfull: >> I tested the rate of transfert from one computer to my updated laptop, >> using this: >> >> dd if=/dev/zero of=test bs=100M count=1; scp test me@laptop:/dev/null; >> >> Without any usb hdd plugged, the rate begins at 4.7MB/s and falls down >> to 2.4MB/s which is acceptable I think. >> >> With an usb hdd plugged (I tested with several devices), the rate >> quickly falls down to 100KB/s sometimes to 20KB/s and sometimes remains >> completely stalled. Moreover, the wifi connection is very often >> disconnected (even when there is no tranfert of data at all). > > It is not uncommon for a laptop's wifi to be on the USB bus. My Dell > laptop does precisely this (it is on one of the EHCI controllers). Yes, it is a laptop Dell (latitude e6540) > >> Why do I think that it an update issue?: 1- because this behaviour did >> not happen before the update... 2- I have another laptop (exacttly the >> same, same brand, same model) which I did not update and this issue does >> not happen! >> >> which of these packages could be responsible for this issue? I can >> exclude the kernel, because I tested the problem with the previous one >> (4.4.6) and NetworkManager* because I downgraded them. > > There was a kernel 4.4.7-300 between 4.4.6 and 4.4.8. Did you test it? > Try rebooting into as many of your older kernels as you have and do the > test. > > If the problem only appears on the 4.4.8 kernel, then my guess is that > kernel-modules for kernel 4.4.8-300 is the issue since that's where the > USB network and (some) disk drivers come from. I doubt if network > manager has anything to do with the problem as it simply manages > connections and has nothing to do with USB bus contention (which is > what you're probably seeing). The problem is the same with all kernels: as soon as a hdd is plugged in an usb port, the rate slows down and even the wifi connection stops. So it is not a kernel modules problem. -- François Patte UFR de mathématiques et informatique Laboratoire CNRS MAP5, UMR 8145 Université Paris Descartes 45, rue des Saints Pères F-75270 Paris Cedex 06 Tél. +33 (0)1 8394 5849 http://www.math-info.univ-paris5.fr/~patte
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